Heiji Hattori and Kazuha Toyama

Heiji and Kazuha

Heiji Hattori and Kazuha Toyama serve as the beta couple for Detective Conan and a foil for Shinichi Kudo and Ran Mouri's relationship.

Relationship analysis

Heiji and Kazuha.

Heiji and Kazuha grew up together and are easily each other's best friend and mutual love interest. They have gone at the same school since they were in pre-school. Neither of them have been shown to have other close friendships outside of their relationships with Shinichi and Ran, though Heiji does have a rivalry with fellow kendo practitioner Okita. They often spend time together, and Kazuha typically comes along when Heiji visits the Mouri's or vice versa, and is usually getting caught up with Heiji in criminal investigations. Kazuha and Heiji both wear twin good-luck charms that Kazuha made with pieces of the handcuff chain that stuck them together temporarily as children.^[1] Kazuha and Heiji have both shown jealousy when the other appears interested in someone else, even though they're not officially in a romantic relationship. Although, all their Jr. High School and High School classmates have commented that they're a couple. Their parents have known each other before they were even born. Making their families close.

Kazuha has demonstrated awareness of her love for Heiji, but has been either too shy or unfortunately interrupted any time she tries to tell him. Heiji, in contrast, is played off in the beginning to be oblivious to her romantic interest in him and has gotten confused many times whenever she tries to confess her love to him. This usually frustrates Kazuha and it leads to their "Old Married Couple" arguing that many people point out make them look like a real couple.

Heiji has been shown to be deadly protective of Kazuha and will put himself in harms way whenever she's in danger, such as when he got shot in the arm trying to protect her from being killed in Private Eye in the Distant Sea and when he refused to let her go when she stabbed him with her arrow when they were hanging off a side of a cliff.^[2] At the conclusion of that same case, he made a silent promise that he would never let her get hurt while he was around.^[2]

Heiji and Kazuha's fathers have worked together on the same police force for many years and are very close friends, it's actually because of their friendship that they even met in the first place. Mr. Toyama has even admitted, albeit teasingly, that he preferred it if his daughter married Heiji instead of some other punk.^[3] Both families are very close to each other and because of that, that's how Heiji and Kazuha were handcuffed together in the first place after they were playing a game of cops and robbers.^[1]

Even though Heiji has been played off as oblivious to Kazuha's failed advancements on him romantically, it's later revealed that he does feel the same way about her. Such as when he grabbed a guy by the neck and asked, "Whatcha Doin' to MY Kazuha?!" when he thought she was being taken away and kidnapped on Ebisu Bridge.^[4] And how he admitted that "Something That Important" (Referencing his love for Kazuha) should be said in a more proper romantic setting than an old bridge. It is during this incident on Ebisu bridge that he finally realised his feelings for Kazuha.^[5]

Heiji and Kazuha moments

Manga/Anime

Volume 19: Files 185-188 / Episode 118: The Naniwa Serial Murder Case

Kazuha accuses Ran of being the Kudo that Heiji is in love with.

Kazuha watches Ran so intently that Ran can sense it, then appears and threatens Ran that if she has any designs on Heiji, she'll have to compete with Kazuha and their childhood bond. After Ran watches Heiji and Kazuha interact, and Heiji explain that the "Kudo" he has been talking about is actually a guy, Ran asks if they are a couple. They both deny it, citing their fathers' connection, but Kazuha admits with a blush that she had been following Heiji and the Mouris for some time to make sure Heiji didn't "get carried away by some Tokyo girl."
When Heiji leaves to investigate the murder, Kazuha calls after him to be sure he has his lucky charm for protection. Heiji confirms that he does and tells her to not worry.
Kazuha reveals with a blush that she hid a piece of the handcuffs in the charm she gave to Heiji, though he may be unaware of it.
When Heiji is shot in the stomach and appears to be dying, Kazuha cries and embraces him, though this makes Heiji angry, because he merely wanted to sleep from being tired, not fatal blood loss.

Volume 21: File 211 & Volume 22: Files 212-214 / Episode 141-142: The Night Before the Wedding Locked Room Case

Kazuha accompanies Heiji to Tokyo to attend a wedding on behalf of his mother, and blushes when she claims coming along was only a favor to Heiji's mother.
Kazuha treats Ran coldly, to Ran's confusion, until Kazuha reveals she is annoyed that Ran and Heiji are wearing matching shirts like they did before in Osaka, as if they had planned it as a couple.
At a temple for prayers, Heiji says Kazuha should ask for nice legs, causing Kazuha to blush.
After the case concludes, Ran pushes Kazuha to wear the same sort of shirt as Heiji. When Heiji notices, Kazuha blushes and says she'll change. Heiji says he doesn't mind, because it makes them look like siblings. Kazuha looks nonplussed by the unromantic comparison.

Volume 23: File 230 / Episode 174: The Symphony Serial Murder Case

Heiji looks at the charm Kazuha secretly slipped into his things, wondering if it's what protected him. Ran realizes where he got it, causing him to blush and say he should have thrown it away already, although instead he tucks it safely away to keep.

Volume 25: Files 246-250 / Episodes 166-168: Tottori Spider Mansion Demon

When Heiji suggests that he and Kazuha might have to cuddle with each other so they won't get a cold while camping outdoors, Kazuha blushes and imagines a sleeping Heiji putting his arm around Kazuha inside the tent.
Heiji frantically calls Kazuha's name and immediately calms down when he sees her. When Yuzo Takeda states how after both Conan and Heiji learned that the place the girls were going was cursed and dashed out, Kazuha, blushes and smiles,then asks if he was worried. Blushing, Heiji denies that's not the case.
Heiji gets a horrified expression when he sees Kazuha tangled in wires; he proceeds to repeatedly shout her name, asking her to wake up. And when Kazuha does wake up, Heiji has a content look on his face.
When confronting the Takeda family on Kazuha being attacked by the murderer, Heiji mockingly states that after Kazuha wakes up, she'll reveal who attempted to kill her. The classic "red, angry" mark can be seen on his head, meaning how furious Heiji is of who tried to hurt Kazuha.
Kazuha blushes and twitches her eyes when Heiji tells her to "take off her clothes" (it had to do with the case). He even tries to take off her shirt, himself. Earning him a well deserved slap in the face.
When the murderer is revealed, Heiji confronts him about how he went too far by bringing Kazuha into things. When the killer dismisses this, Heiji angrily reveals how the man's love died (a misunderstanding due to the killer's lack of knowledge about japanese) just out of spite. Even Conan thought it was cruel to do so, but Heiji held no remorse.

Volume 28: File 279-283 / Episodes 222-224: And Then There Were No Mermaids

Kazuha says she has thought about staying forever young and beautiful. When Ran asks if she wants to because of liking Heiji, Kazuha blushes and tells Ran to not talk so loud.
After the murder occurs, Kazuha happily tells Ran that the criminal will be found soon because Heiji flipped his cap from back to front, signifying his becoming serious. She adds with a blush that Ran shouldn't fall in love with him, because Kazuha can't compete with Ran, causing Ran to hug Kazuha and call her cute.
After the second murder, Heiji tells Kazuha not to wander off, causing her to blush. She takes him at his word and follows as he investigates, as well as offering to protect him with her blessed arrow. Heiji doesn't think much of it, but Kazuha privately affirms that she means it seriously.
In pursuit of a memorial stone, Heiji runs nearly off a cliff, saved only by Kazuha swinging him around to trade places. As a result, she falls, and Heiji dives after her, catching onto a tree in the cliff face with one hand and her with the other. Kazuha believes the branch Heiji is holding will break if he tries to pull her up, and stabs the hand holding her wrist with the mermaid arrow to transfer her "long life" to Heiji. To her surprise, Heiji still doesn't let go and gets them both to safety despite the injury.

“	Even if I die, I won't let you go.	„
— Heiji refusing to drop Kazuha.

After Kazuha expresses her relief that Heiji's hand has apparently already healed overnight, Heiji thinks to himself that he won't let her be hurt (even, apparently, with only feelings of guilt). He showed her and Ran the wrong hand, hiding the bandaged one in his pocket.

“	Fool. You're too naive. I will never... never... let you be hurt.	„
— Heiji's secret promise to Kazuha.

Volume 29: Files 293-295 / Episodes 238-239: The 3 "K"s of Osaka Case

Kazuha overhears Heiji talking secretively on the phone with Shinichi, and assumes that he is "having an affair" with a mysterious woman. She attends the party with Heiji, suspicious that the "woman" asked Heiji to come.
When the murder occurs, Heiji tells Kazuha to keep the suspects staying put, trusting that she'll do so.
Kazuha tells Ran not to worry about Conan helping Heiji investigate, and proudly adds that since Heiji's on the case, no one will get hurt.

Volume 31: Files 314-317 & Volume 32: Files 318-321 / Episode 263: The Naniwa Swordsman and Toyotomi's Castle

At the kendo tournament, Kazuha blushes as she tells Shizuka that Heiji has gotten very strong as a kendo fighter. She also helps Heiji put his gear on (only manga).
Kazuha reassures Heiji's kendo team after Heiji is to preoccupied with the murder investigation to play on the team, saying that they'll win and when they do they'll rub it in his face.
Kazuha grabs Heiji's hand to get to the final match in time.
Exhausted from chasing Heiji at the tournament, Kazuha falls asleep on Heiji's shoulder at dinner. Causing Heiji to blush slightly.
While in the car, Kazuha overhears her father telling Heiji's father that since Kazuha is reaching marriageable age, he'd rather she marry Heiji than some "irresponsible punk". Kazuha blushes at the thought, and is disappointed when her father tells Heizo it was a joke.
Heiji berates Kazuha for giving Kogoro, Ran, and Conan the exact same information and tour he did when they first came to Osaka, making Kazuha angry and embarrassed at Heiji's statement.
Heiji leads Kazuha away from the role play group by the arm when she tries to interact with them more, calling them "Weirdos".
When Kazuha loses her wallet, she refuses to give up looking for it because it had her good-luck charm (with the handcuff chain) and other charms to ward off a murder case inside.
Heiji tells Kazuha not to cry in an uncomfortable voice after a raindrop falls on her face, making her look like she started to cry over her wallet.
Kazuha called her father to help investigate because he knows additional information about the case; she initially tries to get Heiji to leave with her, but then leaves with just Ran because she wants to see his triumphant expression when he's solved the case. When he gets that expression, she blushes happily and assures the others that Heiji knows who the criminal is.
Heiji looks the most concerned when he hears Kazuha's scream in the distance.
Heiji pays close attention to Kazuha as she explains what happened when she and Ran were walking on the bridge to pick up Conan from the crime scene.

Volume 35: File 361 & Volume 36: Files 362-365 / Episodes 291-293: Solitary Island of the Princess and the Dragon King's Palace

Kazuha still angry at Heiji for ditching her on their last date

Kazuha expresses a hinge of jealousy, as well as annoyance, of Heiji guessing what kind of bathing suits the girls on the beach are wearing.
Kazuha gives a mild, red blush when Conan announces that Heiji knew what kind of swimsuit she would be wearing.
It's revealed Heiji brought Kazuha along with him as an apology for not showing up to their last date.
Heiji interrupts two men flirting with Kazuha and Ran. When asked who he is, Heiji answers "My...", which causes Kazuha to blush, before he adds she's merely his childhood friend and a bit annoying, to Kazuha's disappointment. Ran comments in the background that his statement was phrased oddly, as if that might not have been what he originally intended to say.

Volume 38: Files 390-392 / Episodes 323-324: Heiji Hattori's Desperate Situation!

Heiji and Kazuha are held hostage in the attic of Misari Ito's house.
Heiji tries to get their hands free from the handcuffs, but winds up hurting Kazuha when he messes up. Making her call him an idiot while Heiji tells her to be quiet or the others will hear them.
When Heiji drops the pin he was using to unlock the handcuffs, Kazuha becomes panicked and Heiji asks if she has some type of wire with her. She tells him that was the only thing she had.
Kazuha asks Heiji if it would just be better for them to solve the code they gave them, since they said they would be released unharmed if they did.
Heiji and Kazuha are threatened by the two kidnappers that if they didn't solve the code, then they would be as cold as the other guy they caught.
Kazuha whispers Heiji's name softly in fear and Heiji comforts her by saying that they don't know "That Guy" (referencing Shinichi), causing Kazuha to become confused at his statement.
Kazuha looks at Heiji with concern and worry as he is abused by the two kidnappers.
Kazuha asks Heiji if he is alright and that he has to hang on.
When Heiji is punched in the stomach by one of the kidnappers, Kazuha says his name with deep concern.
After Heiji gets his hair pulled by one of the kidnappers to get his ear sliced off, Kazuha exclaims Heiji's name in fear for his safety.
Kazuha yells at the Kidnapper with the knife to stop with tears in her eyes. Not wanting any harm to come to Heiji.
Heiji leads Kazuha to the window where he exclaims in surprise that Shinichi (Conan) was leaving them. Kazuha tells him that he's probably thinking of a way to save them but Heiji doubts her claims.
Heiji, frustrated at their situation, says that he has no other choice but to break the window. Causing Kazuha to freak out at his proclamation.
Heiji turned around when Kazuha began to recount how her father knew Kusukawa-San was a gambler and scolded her for not telling him sooner.
When Kazuha asks Heiji if he has the entire answer to the problem, Heiji smiles and says that he does saying that it is easy to remember if you gamble.
Misari threatens Heiji that if he messed up on the top part of the problem than he would find himself covered in his girlfriend's (Kazuha's) blood.
Heiji and Kazuha are both horrified when they realize Misari's full plan.
Misari asks Heiji if he has any last words to say before she kills him, After a while and a threat, Heiji says that his last words were directed to Kazuha right behind him.
Kazuha's eyes widen when he says that his final words are for her.
When Misari says that his Girlfriend (Kazuha) won't last much longer than him, he says that it's something that he's been wanting to tell her forever and asks for the gun to be put down until he is finished.
When Misari starts to rush Heiji on his last words to Kazuha, he says that he wants to make sure that it is perfect so that she remembers it when she's up in Heaven. Causing Kazuha to blush at his statement.
When Heiji's plan is foiled to get the gun away from Misari, he gets kicked down and Kazuha cries out his name in concern and fear.
While Misari is counting down before she shoots Heiji, He tells Kazuha that he was telling the truth when he said that his final words were for her. Saying that he almost said it over and over and that every time he felt her tremble against his back he, and he stops right there before he embraces for the impact of the gun shot.
Kazuha listens to this in a horrified gaze with tears filling up her eyes.
After Heiji is released and is about to leave with Misari, Kazuha looks at him with scared eyes and asks if they survived this than he would tell her what he was about to say. Causing Heiji to smile and reply that he'll keep saying it until she gets tired of it.
After Misari is arrested along with her accomplices, Heiji tells Shinichi (Conan) that the case was close in many ways. Thinking back to the point where he was almost shot in front of Kazuha when he was telling her his final words.
Heiji started to blush hard when Kazuha asked him what his final words were and scratched his cheek as he started to say them over to her again, but he gets embarrassed and scared and told her that her pigtail was bothering him every single time she moved. Angering Kazuha and causing Shinichi to wince with sympathy, who was listening on the other side blushing as well for his situation.

Volume 39: Files 393-397 / Episodes 325-327: The Red Horse within the Flames

Heiji and Kazuha recall their hostage situation when they spend the night at Ran's apartment.
Before Kazuha could say anymore about Kogoro solving the deciphered code (Which was actually Shinichi's doing), Heiji cuts her off and says that it didn't matter anymore.
When Kazuha looks at Heiji confused about the Arsonist, Heiji takes the time to explain to her and the others what the arsonist is trying to accomplish.
Kazuha wishes Heiji and the others luck on their detective business when she heads off with Ran. Heiji smiles at her and replies back "OK."
When Kazuha comments that Heiji and Conan get along really well, Ran asks if she's jealous of Conan. Making Kazuha deny any such thing.
While walking away Heiji look back slightly, because he is worried about Kazuha.
When Heiji and the others were late coming back to Ran's apartment, Kazuha questions Heiji furiously over the phone.
Heiji explains that they are at a client's house and Kazuha is furious with the news, saying that they would be back by now.
Heiji agrees and says that they were on their way when a couple of firetrucks came by and made them worried. So they went back to discover the house was in flames. Causing Kazuha to become surprised with the news.
Kazuha calls Heiji an Idiot since she thought she had found the perfect shirt that would fit him when she and Ran went out shopping together. Wanting to show him the shirt when they got home.
Ran reassures Kazuha saying that Heiji and the others would be back home soon.
Kazuha becomes severely frustrated with Heiji when it becomes late at night, saying to forget them and go to bed since they're going to Tropical Land in the morning. But Ran stops her before she went to bed by asking to put the teruterubozu over her Dad's window.
When Heiji hears that Kazuha and Ran received a Red Horse key chain, he yells at Kogoro to tell him what block his apartment is on. With concern in his eyes for their safety.
After Kazuha and Heiji see each other again at Ran's place, he asked her in a concerned voice what had happened.
Kazuha is frustrated and angry when Heiji cancels their plans to go to Tropical Land.
When Kazuha and Ran are freaked out about the burnt down building, Heiji asks them why they even bothered to come along with them in the first place with an irritated tone of voice.
Kazuha replies back to him that they came because they wanted to finish the case as quickly as possible so that they could resume their plans to go to Tropical Land together.
It is revealed that Kazuha talks to Heiji's mother frequently and they talk for quite some time together.
Heiji and Shinichi (Conan) are frightened when they are caught talking about Kazuha and Ran's calling habits.
With some common knowledge given by Kazuha and Ran's conversations, Heiji and Shinichi (Conan) are able to figure out the rest of the case.

Volume 43 Files: 441-444 / Episodes 381-382: Which One's Deduction Show

Heiji asks if the tickets for Takarazuka were from the old ladies

Heiji watches in shock as he realizes Kazuha is crying over not being able to solve the message

Heiji and Kazuha were both at the Mouri's apartment to greet Conan when he returned home.
When they arrive at the restaurant, Heiji and Kazuha sit right next to each other.
Heiji and Kazuha are both equally surprised when they hear different plans from each other to go to see Koshien and Takarazuka, causing them to break out into an argument.
When Kazuha says that they can't do both after Heiji mentions the High School Baseball finals, Heiji leans in closer to her and asks if she got the tickets from one of the five women who absolutely love Takarazuka.
Heiji smiles at Kazuha and offers the unsolved murder case as a competition to see if they go to Koshien or Takarazuka.
Kazuha is angered at the proposal, seeing as how Heiji is a better detective than she is and that she'll never win in a competition revolving around deduction and reasoning against him.
Heiji says to Kazuha that it is sneaky of her to get two people to help her out with a annoyed look on his face, Kazuha just sticks her tongue out at him.
Kazuha stands right behind Heiji as he is looking over the spot the dead body was found.
Heiji explains out loud that they don't know if the murderer was an outsider to begin with and stands up to be right besides Kazuha with a smile on his face.
While Megure lays out the pictures in front of them, Heiji stands close to Kazuha's shoulder.
As Heiji is explaining his reasoning behind the ink on the blocks, he smiles and looks back at Kazuha as he continues on with his explanation.
Kazuha stops herself before she praises Heiji's reasoning, reminding her that she is in a competition with him and that she can't allow him to win and figure out the dying message before her.
When Heiji finally figures out what the dying message means, he smiles and looks back at Kazuha. Apologizing that he has solved the message and that he's going to win the competition.
Heiji then realizes that Kazuha is frustrated and that she is starting to cry over the fact that she can't figure out the dying message. Making him soften his expression on his face to concern for her feelings.
Heiji thinks Kazuha's name in a gentle tone of voice and continues to look at her in a gentle fashion.
After remembering what Shinichi said to him about competitions about deductions, he decides to let Kazuha win and he starts to drop hints to her on how to win the competition.
As Heiji drops hints to Kazuha about solving the dying message, he keep turning his direction to gaze into her eyes to see if she gets what he is trying to do. Making Shinichi (Conan) realize what he is doing and smile at his reasoning behind playing dumb all of a sudden.
When Megure says that Kazuha's reasoning must be wrong, Heiji stands up for her and says that her deduction wasn't wrong at all.
When Heiji starts to get wrapped up in solving the case after he has put all the pieces together in his head, Shinichi (Conan) starts to warn him silently that their main intention was to let Kazuha win the competition.
Shinichi (Conan) Is dumbfounded when Heiji solves the case, since Heiji's main intention was to let Kazuha win the competition so that they would all go to Takarazuka instead of Koshien.
Heiji is frightened when he realizes that he accidentally got too wrapped up in solving the case and turns to hear Kazuha congratulate him and says that she'll practice the Tiger's Fight song and turns to leave him.
Heiji cries out for Kazuha to wait so that he can tell her that they can go to Takarazuka.
When Ran suggests that they try to make Heiji want to go to Takarazuka instead, Kazuha denies this and says that the only thing that she wanted to see was Heiji's face after he solves a case and smiles at his expression.
Heiji sits and pouts at his accidental victory and wonders how he messed up on his plan to allow Kazuha to win, making Shinichi (Conan) call him an idiot.

Volume 47:File 487-490 / Episodes 406-408: Conan and Heiji's Deduction Magic

Heiji was irritated for some reason when Kazuha was asking directions from a policeman.
It is assumed that Conan (Shinichi) saw Heiji's jealousy and decided to fool around with him. Conan made his voice similar to Kazuha's and covered Heiji's eyes playfully asking him, "Who am I?"
Heiji blushes as he initially thought it was Kazuha but then realized it was Conan (Shinichi).
Kazuha becomes irritated when Heiji comments on how the female magicians are a couple of "beauties".
Heiji is outwardly jealous when Kazuha and Ran mention that they hugged Hoshikawa and he angrily asks why she [Kazuha] hugged him.
Heiji removes Kazuha's arms from Hoshikawa's arm in a jealous manner.
Heiji is very irritated when Kazuha praises Shinichi as having the best deductive mind.
While talking about the murder case with Conan, Heiji mentions that whenever he sees Kazuha be flirtatious with or talking about another guy, he gets annoyed and he can't concentrate. He asks Conan why that happens; Conan realizes Heiji's feelings, but merely calls Heiji a child because he's so oblivious to the truth.
Heiji gets extremely irritated when Kazuha mentions that Hoshikawa calmed her down.
Heiji tells Kazuha to stay put with Ran while they investigate; Ran recognizes Heiji's jealousy, but Kazuha is oblivious.
Heiji blushes and freaks out a little when Kazuha tightly hugs his arm to demonstrate why a magician couldn't be the killer.
At the end of the case, Heiji states he figured out why he doesn't like seeing Kazuha flirt with other guys; after a conversation with Megure he's concluded that he thinks of her as a subordinate, like her father is a police subordinate to his father. This, understandably, frustrated Kazuha and they start to argue.

Volume 50: Files 518-521 & Volume 51: File 522 / Episode 490: Heiji Hattori vs. Shinichi Kudo: Deduction Battle on the Ski Slope

Heiji and Kazuha up on the Ski Slope Together During the Case

In a flashback to a junior high ski trip, Kazuha stays out at the foot of the slopes despite a broken ankle because she wants to watch Heiji skiing. Heiji appears in a deliberate splash of snow to tease her (for the fifth time), and then gets teased by his classmates for being around Kazuha and her female classmates. With a faint blush, Heiji tells Kazuha to go back inside so she doesn't get sick, which causes her to blush in return and agree to do so. After he leaves, Kazuha's classmates tease her gently about liking him.
At lunch, some boys tease Heiji and Kazuha about being a couple when Kazuha sits next to Heiji rather than the other girls in their class.
Kazuha tries to stop Heiji from investigating an old murder despite an incoming snowstorm. They overhear Sonoko teasing Ran and Shinichi about being a couple, assume it's directed to them and blush, and Heiji starts to vehemently deny it until he realizes Sonoko isn't looking at them.
When Heiji berates his mother for following him on the ski trip to add to her videotape collection of him growing up, Kazuha blushes and thinks that she would like to see those tapes.
Kazuha's classmates realize that Kazuha got herself promoted to the advanced skier group to be in the same group as Heiji, despite not being very good at even getting off the ski lift. She admits it and asks them not to tell Heiji about it. She also accompanies Heiji through the rest of his investigation, which also aggravates her ankle. He call her an ahou, but carries her piggyback and thanks her for her assistance in what he's figured out about the case so far. Heiji also concludes that she got into the advanced skier class to show off, unaware that Kazuha is blushing and smiling from the closeness as he carries her, and to be closer to him was her true aim.

Volume 54: Files 560-562 & Volume 55:File 566 / Episode 479: Three Days With Heiji Hattori

Heiji watching Kazuha

When Heiji looks intently at Kazuha blowing on a pinwheel, Kazuha blushes, although Heiji was actually staring at the pinwheel as a clue about a murder case.
As Heiji leaves for the detective competition with Conan, Kazuha calls out to Heiji with a blush that as the representative from Osaka, he can't lose.
When Hakuba asked if Heiji had told anyone where he was going, Heiji answers he has, while thinking of Kazuha.
After arriving to the island, Kazuha and Heiji call for each other's name. The former for confirmation and the latter out of happiness.

Volume 59: Files 613-618 / Episodes 516-517: Furinkazan

Heiji and Kazuha looking at a photo of the murder victim

Kazuha realizing Furinkazan can be applied to Love as well

Kazuha about to attempt to confess her love

When looking at the picture of the murder victim, Kazuha is behind Heiji, with her hand on his arm.
Heiji tells Kazuha to stay behind while he and Conan go investigate, and when she asks why, he responds by telling her she'll just be a drag. However, Ran explains that Heiji is only doing it because he doesn't want Kazuha in danger.
Heiji teases Kazuha that she shouldn't sleep with her belly showing.
After learning about Furinkazan, Kazuha blushes while thinking about Heiji.
Heiji worriedly asks Kazuha what's wrong, after the she calls him.
Yui Uehara notes that Kazuha likes Heiji, and counsels her that while waiting can be enough, sometimes it's better to act; if she doesn't, the chance to tell Heiji her feelings might disappear.
Kazuha decides to confess to Heiji and drags him off somewhere private, despite his protests and attempts to excuse himself. However, in the end, she can't bring herself to do it and walks off with a deep blush to join Ran. Heiji once more acts oblivious to Kazuha's intentions.

Episode 554-555: Stork Mystery Tour

Heiji and Kazuha both come up to Conan and the rest of the group with smiles on their faces.
Hearing the news that Ran has gone missing, Heiji and Kazuha both let out a surprised and shocked gasp.
When Mitsuhiko shows Heiji and Kazuha the picture of the girl Ran was chasing after, Kazuha grabs Heiji's shoulders and leans on him as they both look at the picture.
Heiji reveals that Haruna was the reason why he and Kazuha were there in the first place, stating that Haruna's been missing since the day before.
Heiji and Kazuha ride in the back of the car together as they tail the car ahead of them containing Haruna.
Kazuha warns Heiji that Haruna saw them and Heiji tells the driver to slow down so that Haruna wouldn't know that they were following her.
When Haruna finally gets out of the car and out onto the streets again, Heiji and Kazuha lean in close to the window against each other to see where she's going.
Heiji and Kazuha race after Haruna after they spot her in the garden areas of a local park.
Heiji and Kazuha continue to race after Haruna as she crosses several parts of town until they get to the Eirakukan Play House.
Heiji and Kazuha run to Kannouden shrine together and Kazuha asks why the shrine is Gonbee-san, Heiji answers her by explaining the name origins of the Shrine and that the name belonged to an ancient Feudal lord name Gonbee Hidehisa.
Heiji turns to Kazuha and says that Haruna should be around where they were.
Once Haruna sees that they've found her, Heiji and Kazuha chase after her once again down the steps to the shrine but are stopped by a group of women.
Heiji and Kazuha arrive just in time to see Haruna get in the car with the kidnapper holding Ran hostage.
When Heiji and Kazuha discover where Ran was being held hostage, Kazuha cuts in front of Heiji asking Ran in a happy tone if she was alright.
Heiji and Kazuha stand side-by-side as they watch Haruna resolve everything with her parents and the reunion of the two pieces of the statue.

Volume 66: Files 693-695 / Episode 573-574: The Whereabouts of the Embarrassing Charm

Kazuha is asked by a family acquaintance to make a good-luck charm for his upcoming tennis tournament. While she is caught up in aikido practice the day he is supposed to pick it up, Heiji accidentally gives the man Kazuha's personal charm rather than the one she'd made. Heiji goes to Tokyo to get it back; when he asks Kazuha why she even came along, she blushes and doesn't answer. Later she privately confides to Ran that she came to get the charm back without letting Heiji look inside, because she secretly keeps a small photo of his face inside it. Ran agrees to help, but teases Kazuha with the possibility of showing Heiji the photo.
After the case is solved, the charm is released from police evidence to Heiji, which causes Kazuha to panic and run after him. By the time she arrives, Heiji has already opened the charm—but the tennis player scribbled all over the picture in frustration at realizing that Kazuha wouldn't return his feelings, so Heiji concludes that Kazuha thinks he's ridiculous rather than being in love with him.

Volume 70: Files 734-734 / Episode 610: The Victim is Shinichi Kudo

When Heiji arrives at the Mouri residence to invite them on a real demon dog hunting case, he stands quite close to Kazuha as they both smile at them.
After Heiji and Kazuha sit down to explain why they're there to begin with, we see that Heiji is sitting by Kazuha's side at a very close proximity.
Kazuha tells Ran that the demon dog statement was just a story that they heard and Heiji corrects her saying that they don't know if it is just a story or not in a patient tone.
As Heiji talks about the death of the original master of the Inubushi house, Kazuha gazes at him intently as he explains what really happened back then for the case.
When Conan asks Heiji how he got a hold of the case, Heiji tells him that he got the case from Kazuha's mother.
Kazuha admits that the case was originally meant for her father, but since he couldn't leave Osaka city he decided to get someone to go in his stead and picks Heiji to take on the case.

Volume 70: Files 734-740 / Episodes 611-613: Inubushi Castle, The Ablazed Demon Dog

When Kazuha asks Heiji if the victim was really a adopted son of the Inubushi family and that a pearl really did fall out of his mouth the other day, Heiji smiles and turns around saying that it was true.
Kazuha comments on Heiji's closeness with Conan with a smile and jokes that Conan is like Heiji's little assistant.
After Kazuha hypothesizes that the final member of the Inubushi family could have sustain facial injury and could be wearing a mask, Heiji looks over at her in an annoyed way and thinks in his head to her that this wasn't the Inugami clan.
When sitting down for tea with Miyuki, Heiji and Kazuha are sitting across from each other at the table while they listened to her story.
As Kazuha is making a proper prayer at the grave to the dead dog so that she won't get cursed, Heiji looks at her with an annoyed look on his face and thinks to himself to her that there's no such thing as curses.
Heiji yells at Kazuha to go call the police and an ambulance after the missing adopted Inubushi child falls in front of them from on top of the cliff and informs her saying that he, Conan, and Kogoro will be going to the top of the cliff.
Kazuha yells at Heiji that he shouldn't leave them alone at a place like this (referencing the crime scene) and Heiji instead leaves with Conan and Miyuki up the hill after Conan leaves Kogoro to wait with the girls.
Kazuha reacts in horror when Heiji says that it was as if a flaming dog had passed through at the scene of the crime.
When Kazuha says that the stories about the demon dog are true, Heiji scolds her and replies with an annoyed look on his face that there's no such thing as a demon dog. But smiles at her saying that it was just a trick.
As Kazuha and Ran start talking about what had happened when the ambulance picked up Saki's body, Heiji looks over at Kazuha intently and reacts when she says that there was a marble at the scene of the crime.
When Heiji asks if they had the marble with them, Kazuha and Ran replied that they thought it was an offering and left it at the crime scene.
As Heiji leaves with the inspector, Conan, and Kogoro to the scene of the crime; he tells Kazuha to be good and to wait quietly for him to come back.
When Kazuha and Ran object to being left behind since they were the ones who found the marble, Heiji replies back that they could come along with them but the demon dog could appear again. Making Kazuha and Ran understand where he was getting at and decide to stay behind.
When Heiji receives a call from Kazuha, he tells her that it's going to be a while and that she should go to bed but then yells out in shock when Kazuha tells him that the dog showed up at the house.
Heiji questions Kazuha whether or not the dog was really on fire with a concerned look on his face as Kazuha nods her head and replies that is was.
As Kazuha brings up that she smelled something when she fell, Heiji asks intently what kind of odor it was as he gazed at her intently.
Kazuha and Ran are disappointed when it turns out that Heiji and Conan weren't as stupefied as Kogoro had told them they were to begin with, hinting that Kazuha actually wanted to see him stumped for once.
When Kazuha says that Princess could be referencing Miyuki since the same kanji is part of her name, Heiji calls her an idiot and says that couldn't be the case.
Heiji asks what Kazuha and Ran are doing as they are eating Dinner later that afternoon with an annoyed look and they reply that they're watching a re-run of a quiz show and trying to guess the answer to a question.
Heiji and Conan agree when they both ask the girls why they aren't in bed since it was 1:00 AM in the morning and Heiji mentions that their futons are ready in their rooms.
When Kazuha tells Heiji that it's because their afraid of the demon dog that they can't go to sleep, Heiji starts to try and talk her into going to bed.
Kazuha challenges Heiji to solve the question the game show to see if he can do it before the time runs out, saying that they'll go to bed if he can answer it correctly.
When Kogoro believes that Miyuki is the serial killer in the Inubushi family, Kazuha rushes to Heiji's bedside to wake him up to see if what Kogoro is saying is the truth or not. Only to be surprised when Heiji isn't there.
After the flamed demon dog appears to be just a regular dog in a cloth, Kazuha questions what it had around it's body. Heiji answers her by walking up behind her and answering it was imitation fire with a smile on his face.
While Heiji is explaining how the dog can appear and reappear with the help of the cloth and the tricks behind the attacks, he stands very close to Kazuha.
Kazuha asks Heiji if the smell she smelt before was the lighters used for the trick for the footprints, Heiji smiles and replies that it was and explains why she fell in the first place before at the house when she was being chased by the dog.

Volume 74: Files 778-780 / Episode 651: Conan vs. Heiji, Deduction Battle Between the Detectives of the East and West

Heiji and Kazuha stand very close to each other as they ride the public transportation bus to the Mouri residence.
While on the public transportation bus, Heiji notices Kazuha's anxious behavior and asks her what she's doing in a curious tone a voice.
Kazuha replies that she can't help it since her mother wants her to buy some retort-pouch curry for her back at home, Heiji gives her a look and tells her that she doesn't need to look for it right now with a sigh and asks her why she can't buy it later.
Kazuha says to Heiji that it's precisely his kind of attitude that always causes her to miss her opportunity to buy Shinshu Miso for her when they were in Nagano, causing Heiji to become slightly offended and annoyed by her reminder.
After Kazuha spots the family restaurant that sells the curry, she tells Heiji to go on ahead without her to Kogoro's place and that she'll meet him there. Shocking Heiji with her actions.
When Kazuha yells for the bus driver to stop, Heiji tells her that the bus isn't a taxi with an uncomfortable look on his face.
Heiji yells Kazuha's name out of the bus window for her, but Kazuha tells him goodbye and leaves. Making him yell out her name one more time before he gets cut off mid sentence by the distance between them.
Heiji later asks what's up with her with an annoyed look on his face.
After Ran asks where Kazuha is, Heiji smiles and replies that she's out running an errand and starts to tell the story about how her mother sent her out to buy her the curry since it's only sold in Tokyo family restaurants and how she saw it before they arrived.
Heiji receives a phone call from Kazuha and he picks up to ask if she got her curry yet, Kazuha yells for Heiji to help her and Heiji becomes alarmed as to what is going on.
When Heiji says that she should be at the family restaurant, Kazuha replies that she is but someone had died in the bathrooms and it's causing a huge disruption in the building.
Heiji asks Kazuha if it was a murder and Kazuha replies that she doesn't know, only that a huge foreign man told everyone not to leave the shop so she can't leave.
Heiji tells her that he understands and that he'll be there soon so she should hold on for him.
Heiji announces to everyone that they heard what was going on and that he was leaving to go help Kazuha. Only to be stopped by Sera when she decides that this would be a perfect opportunity for Heiji and Shinichi to decide who is the greater detective.
When Heiji and the gang finally arrive at the family restaurant, he asks Kazuha if the foreigner spoke English when he told everyone to block the exists and the restrooms. Kazuha replied that he spoke Japanese and that he was the first to discover the body.
When Heiji exclaims in a rude tone of voice that Ran was actually familiar with Special Agent Camel, Kazuha grabs Heiji by the arm and tells him that he's being rude for pointing out him in a mean way. Even if it is true, only to be told she did the same thing by Ran.
Kazuha overhears Heiji saying that he's hungry and calls him over to the table to eat with her, Ran, and Kogoro. Heiji yells at her saying that they've been working while they've been eating in a teasing and slightly ticked off tone of voice.
Kazuha defends her actions to Heiji by saying that they were hungry and couldn't help but order something to eat since their stomach's were grumbling.
When Heiji asks if the dishes they're eating really are the dishes that the suspects ordered, Kazuha confirms it to him by saying that Kogoro asked the waitress about it.
Kazuha then goes on to explain that each of them are eating the same dishes that the suspects are eating to Heiji and Conan.
When Heiji is yelling at the three suspects about one of them having a Kansai dialect, Kazuha rushes up to him asks why he's so riled up.
Heiji replies to Kazuha that he's riled up because he's finally taking the lead in the case and if he doesn't solve it soon, Shinichi will beat him.
Once Conan, who is pretending to have heard the entire deduction from Shinichi over the phone since he is Shinichi, says they'll figure out who the culprit is with a magical dish, we see that Heiji and Kazuha are standing very close in proximity to each other.
After Heiji and Kazuha drink the miso soup that Conan (Shinichi) had told the restaurant to make, they have the exact same reaction saying that it's spicy.
When Conan (Shinichi) reveals who the killer is, the culprit tries to take down Kazuha after failing to move pass Ran. Though Heiji yells at him that he shouldn't go that way either but is to late to warn him after Kazuha flips him on top of a table.
Heiji and Conan (Shinichi) sigh as they said that they shouldn't go those ways to begin with, since they knew their girlfriends could take him out.
Kazuha is shock to hear that Heiji and Shinichi were competing against each other during this case since she wasn't there to hear the challenge that Sera had set up.
As Heiji is reading the letter he received from a dead culprit who had contacted him to the others, Kazuha gazes at him with a concerned look on her face.

Volume 74: Files 781-784 & Volume 75: Files 785-786 / Episodes 652-655: The Design of Poison and Mirage

Kazuha tells Ran that she'll gather up her courage and confess her feelings to Heiji after she hears that Shinichi had confessed his love to Ran in London.
Heiji is scared and nervous when he feels Kazuha "glaring" at him from behind.
Kazuha finally gathers her courage and tells her feelings to Heiji:

“	Ya might have already heard this from Kudo-kun, but...In London, apparently Kudo-kun confessed his feelings to Ran-chan.That's why, though I wouldn't have said this...The truth is...The truth is, I also...Since a long time ago...I... I LIKE YA VERY MUCH!	„

Kazuha is disappointed when Heiji didn't hear her confession; he ran off to tease Shinichi about confessing his feelings to Ran just as Kazuha was about to confess.
Kazuha is envious and jealous of Conan's close relationship with Heiji.

Volume 79: Files 831-833 / Episode 710-11: "Everyone Saw"

Heiji and Kazuha arrive at the Mouri residence side by side and Kazuha gives him a look when Heiji accidentally slips Shinichi's name when he greets them.
Kazuha calls Heiji rude since the case they have to work on is a murder case after he covers up what he said about Shinichi.
While Otaki is explaining the murder case to Kogoro, Ran, and Conan, Heiji and Kazuha stand close together behind Otaki.
After Kazuha states the information about the chair and how it couldn't have been a suicide, Heiji agrees saying that it was used to make it seem like a suicide actually happened to cover up the murder.
Heiji yells at Kazuha to stop messing around in an irritated tone since they're not going to the room to fool around, Kazuha replies that she knows that and that she knows she has an important role.
Kazuha confirms that the chair is the same design and the same color as the chairs she has at home, telling Heiji that the case really is strange.
Heiji replies back to Kazuha that that's what he's been saying from the beginning with an annoyed look on his face.
When Heiji activates the cleaning robot, Kazuha yells at him and asks what he's doing with the robot.
Heiji replies that he's solving the mystery, and proceeds to explain to Kazuha how he didn't use the chair to commit suicide and how he actually used a trash can.
Kazuha looks concerned at Heiji after he solves the case, noticing how depressed his expression and body language is.
While Heiji is talking to Detective Otaki and Detective Takagi about the murder, we see that Kazuha stands directly behind him as they all investigate the scene of the crime.
Kazuha yells at Heiji to stop fooling around after Heiji deems the shooting in the elevator to be a murder instead of a suicide, but Heiji remains calm and continues to explain his reason for believing that the case is a murder instead of a suicide to them.
Kazuha gazes at Heiji as he continues to explain how the crime is a murder in an entranced state looking confused, yet impressed at the same time.
Kazuha freaks out after Heiji turns his hat around on his head, an action that signifies his interest and excitement for a case, and says that they were supposed to catch the next train back to Osaka.
Kazuha complains to Ran about why Heiji is taking so long and is relieved when Heiji comes back with the others after questioning the suspects.
After the case is over and Kazuha offers Conan to stay with them since Heiji was complaining about the space, Heiji glares at him and tells him to watch himself and calls him a pervert in his mind. Showing his protective jealousy over Kazuha.

Volume 79: Files 834-839 & Volume 80: File 840 / Episodes 712-715: Heiji Hattori and the Vampire Mansion

Kazuha falls asleep on Heiji's Shoulder

At the beginning of the episode, we see that Heiji and Kazuha are standing quite close to each other and smiling while they talk with Ran, Kogoro, Conan, and Goro Otaki.
After Kazuha wishes Ran farewell, Heiji follows her away from the Mouri's and Conan to head back home to Osaka.
Heiji and Kazuha share an equal look of confusion when Otaki says that he has some business to attend to first before they leave.
When Heiji, Kazuha and the others decide to find out where Otaki was going to, they decide to follow him with Heiji in his car with Conan and Kazuha with Kogoro and Ran in the car behind him.
After they arrive at the destination of the case, Kazuha freaks out when she hears that the owner is a supposed vampire. Heiji tries to calm her down by saying that he said bumper-bumper instead of vampire so that she wouldn't freak out about the case.
Kazuha invites Heiji to look around the mansion with her, saying that it looks like a castle and that it's really cool. Heiji gives her a look though when she says this because of all the new vampire information he's been given by the butler about the owner.
When Heiji hears Kazuha and Ran scream after discovering the dead body, he runs with Conan to the room to ask what happened with a concerned tone.
Heiji informs Kazuha that there wasn't anyone in the coffin, making her react in shock and telling him that had to be a lie.
After Kazuha and Ran say that it was as if the master was Dracula himself, Heiji looks at them intently and intrigued by their statement.
Heiji sticks with Kazuha's story about the master being inside the coffin and asks Otaki to take a blood swipe to analyze for any DNA, showing his trust in Kazuha.
When Kazuha and Ran scream again, they rush to their sides to see what's the matter.
After Kazuha and Ran discover the case revolving around vampires to be true, they dash out of the room with Heiji calling out to Kazuha to come back with Ran.

*When they see that the master really is in the photo like Kazuha and Ran said, they try to say that it had to be another trick by him. But Heiji defends Kazuha's statement saying that the master was indeed in the same place where she saw him.

Heiji gets frustrated when he can't find Kazuha when they go back to the kitchen to show the girls the picture they took of the master.
After Heiji assures Kogoro that the girls will be safe, he says in his head that they're to busy making gyoza.
Heiji starts to fear for Kazuha's safety after they think that the killer is actually Hikaru on a streak of revenge.
When Heiji and Conan hear Kazuha and Ran scream, they rush to the kitchen and Heiji yells out her name in concern.
After Kazuha blocks out her ears and says she doesn't want to hear about the strange occurrences in the house, Heiji reassures her with a smile that half of them have been solved already.
Kazuha reassures Ran after they see a shortage in their gyoza that they can just make more if Heiji and Conan want to eat some.
When Kogoro yells at Heiji through the phone if his daughter is alright, Heiji reassures him saying that she's making gyoza with Kazuha in the kitchen.
Heiji calls Kazuha with his cellphone and Kazuha happily asks if Heiji wants some gyoza, informing him that there is plenty left if he was hungry.
But when Heiji continues to talk with Kazuha over the phone, Kazuha tells him that she understood her task and hanged up. Asking Ran for some hairpins.
When Heiji is confronting the real killer: Jouhei Hagawa about the coffin, he brings up that he immediately rushed to the room after Kazuha screamed when she saw the dead master.
After the case is solved, Kazuha sits right next to Heiji in an exhausted state from being at the mansion up so late at night and making gyoza that she falls asleep on Heiji's shoulder. Causing Heiji to blush at the sudden physical contact from her.
Heiji gives a look of disgust when he smells the amount of garlic that is all over Kazuha's body since she was up and eating garlic gyoza.

Volume 83: File 879-881 / Episodes 763-764: Conan and Heiji, Code of Love

Heiji denies his love confession on Ebisu Bridge with a blushing face.

Heiji is shocked when he sees Kazuha at the drug transaction site talking with a mysterious man.
Heiji is annoyed when Kazuha seemingly flirts with the mystery man.
When Kazuha falls into the man's arms, he becomes unable to concentrate on the case at hand.
While Heiji is talking to Conan, he keeps his eyes on Kazuha's interactions with the mystery man.
Heiji's eyes widen when Kazuha falls into the mystery man's arms.
When it seems like Kazuha is being kidnapped, Heiji's mind completely shuts down from all outside thoughts and focuses all of his attention on stopping the men from taking her away.
Heiji slams the man by the neck and angrily exclaims:

“	Whatcha doin' to my Kazuha!?	„

Kazuha is seen blushing in awe at his sudden love confession in the background as she is held by the two men.
After being released from the Police Station, Kazuha confronts him about the love confession but Heiji tells her that unless she has evidence pinning him to his confession than he wasn't gonna listen to her case at all.
It's revealed at the end that Conan had recorded Heiji's entire love confession to Kazuha on his phone.

Volume 86: File 909-912 / Episodes 808-809: The Kamaitachi Inn

When Conan and Heiji are speaking to each other in the phone, Conan reveals to Heiji he recorded his confession to Kazuha and plays it, causing Heiji to be both shocked and embrassed while blushing.
While attempting to use the light on his phone, Conan accidently plays the audio file containing Heiji's love confession. Heiji is blushing when it plays while also embrassed as Kazuha is nearby.
Kazuha reveals to Ran about Heiji's confession.
Heiji reveals in his thoughts he is denying the confession to Kazuha as believes it wasn't as special as Shinchi's confession. While Shinichi confessed to Ran in front of the Big Ben in London, Heiji only confessed to Kazuha at the Ebisu Bridge in Osaka. This reveals that Heiji wants to wait for the right time and place to truly reveal his real feelings for Kazuha. Heiji is also shown to be slightly blushing when thinking these thoughts.
Conan reveals to Heiji he deleted the audio file containing his confession, but reveals to him that the Detective Boys copied the file and Haibara uses it as her ringtone.

Volume 88: File 931-935: Zombie Movie Murder Case / Episodes 830-832: A Cottage Surrounded by Zombies

When the zombies appear, Heiji tells Kazuha to take Kogoro upstairs. She protests, concerned for his safety, but Heiji assures her that he won't let any of the zombies get through.
Ran asks Kazuha whether she and Heiji came to the cottage all the way from Osaka on the bike, but after Kazuha explains how they got there, Ran teases her by asking if Kazuha forced him to bring her all the way out here. Kazuha reveals that Heiji is the one that invited her, saying that there was something important that he wished to discuss with her (his confession).
On the way home, Heiji attempts to confess to Kazuha but a zombie extra popped out, ruining the moment. Heiji drives off, thinking to himself, this is not the place [to confess].

Volume 90: Files 958-959 & Volume 91: Files 960-962: Curse of the Nue / Episodes 872-874: Conan and Heiji's Nue Legend

Heiji tries confess his feelings

Heiji gets mad at Tsurumi for flirting with Kazuha.
When Ran and Kazuha say that they are scared to stay in the room of the deceased foreigner, Tsurumi offers them to stay in his room, but Heiji roughly pushes him aside saying that he can stay in his own room.
Heiji had planned to confess his love to Kazuha in front of a beautiful lake, during sunrise as he wanted the place to be better than Big Ben in London.
When Kazuha says that she is getting a strange feeling because of all the monster talk, Ran tells her that what she is feeling might be love, as she overheard Heiji ask the manager whether the place was really more beautiful than Big Ben in London.
When Kazuha and the others saw the "nue" for the third time, Kazuha yelled for Heji to come help her.
Heiji tries to confess his feelings saying that "He didn't realize this until the Ebisu Bridge incident", but was interrupted by the self-defense squad.

Volume 92: File 981 & Volume 93: Files 982-983: Murder inside Café Poirot Case / Episodes 885-886: Solving Mysteries at the Poirot Café

Heiji invites Kazuha to Kinza to check out lights, hoping to finally confess to her.
Kazuha says she's glad she is alone with Ran when seeing the lights because she knows she'd be going crazy if Heiji was with her. Ran pretends to be Heiji trying to cheer her up by saying "I love you!"

Volume 93: Files 990-992 & Volume 94: File 993: The Kendo Tournament of Love and Mystery / Episodes 916-917: The Kendo Tournament of Love and Mystery

Kazuha cheers on Heiji in his Kendo tournament.
When Heiji is getting ready to face off with Soshi Okita, he vows to beat him and even their score (Okita beat Heiji last time). Then he glances back at Kazuha with a blush and promises to also confess to her.
Before Takagi runs off to stop the tournament because of the murder, Heiji stops him, saying that he can't stop the tournament. Confused, Takagi asks him why, to which Heiji responds, "because, well... I-I... There's something I've got to say to her after I win this tournament!" meaning he wants to confess to Kazuha. Everyone blushes, including Heiji, who is still adamant that Takagi does not cancel the tournament.
Sato teases Heiji, saying that they won't stop the tournament because they have all their suspects before them and there is something romantic about this particular competition, causing Heiji to look exasperated and shy.
After the mystery is solved, Ran drags Okita and Heiji back to the tournament only to find out from a tearful Kazuha that the match is already over and their opponents won by default. Once again, Heiji's plans to confess to Kazuha are thwarted.

Volume 94: File 1000-1003 & Volume 95: File 1004-1005: The Crimson School Field Trip Case / Episodes 927-928: The Scarlet School Trip

When Heiji is in Kyoto solving a case with Shinichi, he gets a call from Kazuha, who angrily demands to know why he is in Kyoto at all since he told her he was sick. This leads to their "old married couple" back-and-forth bickering.
Momiji tells Heiji that the letter the murderer left reminds her of places in Kyoto, but Kazuha overhears Momiji's voice and frantically asks if she is there. To make Kazuha jealous and infuriate her, Momiji tells her not to worry and that she would take care of Heiji for her, ending the call in the process. This leaves Kazuha flustered and livid.
When Heiji is taking Shinichi back to Tokyo on his motorbike, he teases him by saying that he saw Ran giving Shinichi a kiss on the cheek at the Kiyomizu butai. Secretly, Heiji is frustrated and thinks to himself with a blush that Shinichi unintentionally ruined another one of the beautiful places on his list to confess to Kazuha.

TV Original/Episode 965-968: Kaiju Gomera vs. Kamen Yaiba

Heiji willingly choose to be in a photo with Kazuha and a Gomera statue when Kazuha asked him to.
Heiji wiling choose to be in a photo with Kazuha and Kamen Yaiba when Kazuha asked him to.
Heiji bought Kazuha a Kamen Yaiba hairclip.
Kazuha felt guilty for how she treated Heiji of her fangirlness with Kamen Yaiba and Gomera got her carried away.
Heiji assured Kazuha when she was in doubt of disarming a bomb.

Volume 96: File 1018-1021: Kaitou Kid and the Fairy's Lip / Episodes 983-984: Kid vs. Komei: The Targeted Lips

Heiji wants to confess his love for Kazuha by catching Kid before Conan.
Heiji tries to kiss Kazuha although he didn't know she was Kid in disguise.

Volume 98: File 1039-1042: Lover Code Case / Episodes 1024-1025: Momiji Ooka's Challenge

Heiji tries confessing to Kazuha at the Haido Harbor but fails again, as Momiji and Iori ask her to take a photo and she runs off.

Volume 100: File 1067-1069: Shintoist Temple Case

Kazuha went to Haido Shrine to get a special good fate charm to win Heiji Heart.
Heiji went to the shrine as well his confessions to Kazuha was always interrupted so he decided to get a special good fate charm as well so he will get luck.
Kazuha blush when Heiji got in the way of her to protect her from Torahiko Kawano threats.
Kazuha knew that "Hyouga Koumoto" was actually Heiji from the beginning and she was trying to make Heiji confess his love for her.
After Heiji was exposed he reveals that he came to get the amulet and so Kazuha says that She is like his sister and Heiji should tell her who it is for. Heiji and Kazuha then have a fight and so Heiji's confession fails once again.

Movies

Movie 7: Crossroad in the Ancient Capital

Heiji is freaked out when Kazuha comes up right besides him out of nowhere during his introduction to the movie. Calling him an idiot and they get into a small argument.
Kazuha wishes Heiji good luck when he goes off to investigate.
Kazuha doesn't enjoy her time with Ran and Sonoko when they sight see together through Kyoto since she is thinking about Heiji.
Kazuha is openly jealous and sadden with how Heiji looks for his first love in Kyoto whenever they visit. Expressing this to Ran and Sonoko in a sadden tone of voice.
Heiji explains to Conan that he met his first love in Kyoto and it shows a young girl resembling Kazuha as she played with a ball and singed.
Kazuha is afraid and hurt that Heiji has supposedly met his first love.
Heiji waves at Kazuha from the upper level of the house with a smile, but Kazuha pouts and says that he really makes her angry.
When Kazuha asks who the criminal could be, Heiji looks at her and replies that Ryuen-San, Saijou-San, Mizuo-San, or Chika Suzu-San could be the killer.
Heiji looks wearily at Kazuha when he almost slips Shinichi's name out loud in front of her and the others.
Kazuha rides with Heiji on his motorcycle and chases the same man who had almost murdered him in the woods. Holding onto him tightly as they jumped a wooden ramp.
Heiji tells Kazuha to stay with his Motorcycle as he goes off to chase the criminal but Kazuha calls out his name to stay with her.
Right before the criminal is about to finish off Heiji, Kazuha arrives just in time and hits the criminal on the head. While motioning the non-existent detective where the criminal is.
Kazuha asks if Heiji is alright, to which he asks where the detective is. Kazuha reveals that there wasn't any detective to begin with.
Heiji asks where Kazuha learned how to ball up her sock and make a weapon, saying to her that she can be a terrible woman with a smile on his face. Passing out in her arms.
Kazuha freaks out about Heiji's condition when he passes out.
When Heiji wakes up in the hospital the next morning, Kazuha is at his bedside. Heiji says her name softly and Kazuha gives him a gentle smile of relief.
Kazuha asks Ran to look after Heiji while she goes out.
Heiji is worried when he learns that Kazuha has been kidnapped by the criminal through a phone call on his cellphone from her.
Kazuha tries to warn Heiji through the phone before the criminal hangs up that they'll kill him and that he shouldn't come.
Heiji is worried and concerned for Kazuha's well being and says her name twice in concern and finally gives up realizing that the connection has been lost.
Before one of the other men in the temple could hurt Kazuha with their swords, Heiji quickly defends her by counter attacking him and pushing her behind him.
Before Heiji and Kazuha leave the temple grounds, they are stopped by the rest of the men of the group and Heiji wraps his arm around Kazuha's shoulder protectively.
Kazuha yells for Benkei to stop fighting because the Heiji there was an impostor which turns out to be Shinichi the entire time.
Heiji reveals himself as being one of Benkei's men in disguise and apologizes to Kazuha for making her wait. Making her angry and yelling at him and calling him an idiot.
Heiji turns her around to cut away her ropes and protects her as the other henchmen try to attack her and Shinichi.
Heiji makes Kazuha swear that she won't tell anyone that she saw Shinichi that night.
Heiji runs away with Kazuha by the hand and leads her away from Benkei's men, only to be chase into pursuit.
Kazuha tells Heiji that Benkei's sword is one of the many drawers of the room she was held captive in.
Heiji is frustrated with trying to figure out the rest of the Temari song when Kazuha starts to sing it and reveals the location of the sword through the lyrics.
Heiji looks at her surprised when she started to sing the Temari song, possibly remembering his first love.
Heiji moves in front of Kazuha protectively as he grabs her hand with his other hand on the found sword. Threatening Benkei to stay away from them through his body language.
Heiji protects Kazuha as he deflects the other swords as they run through the halls and out of the temple room.
Heiji tells Kazuha that he's going to distract the others while she runs and escapes. When Kazuha refuses, Heiji tells her again to run and leave with a serious look on his face. Causing Kazuha to say his name gently and finally agreeing to leave when she is told to escape.
After Benkei and his gang were gathered up and arrested, Kazuha runs up to Heiji in relief and Heiji smiles at her as they reunite.
Heiji corrects her on the mistake she made while she sang the Temari song again at the train station. Then he asks her where she learned the song in the first place.
Kazuha tells Heiji about the time when they were children and how she had brought him along to go visit her relatives, dressing up in a Kimono and looking for him since he had left before she was finished with her preparations. When she didn't find him at the Castle grounds, she found a ball and began to play with it while singing the song her relatives taught her. With the Cherry Blossoms flying in the air, the whole scene turns out to be what Heiji saw when he woke up after being knocked out.
Heiji realizes that Kazuha was his first love and he smiles fondly at the realization.
Kazuha asks if Heiji had finally met his first love in Kyoto and if it was the dancer woman and Heiji tells her that he'll never tell her. Teasing that it'll be 1,500 years before he tells her.

Movie 10: The Private Eyes' Requiem

When Heiji meets Conan during a hunt for clues for the case, he reveals that he has a wristwatch bomb as well and that Kazuha is being held as a hostage inside the amusement park against him.
Heiji says that Kazuha doesn't even know that she's being used as a hostage and that she is probably enjoying herself in the amusement park. Smiling at the thought of her enjoyment and naivety to the situation she's in.
Kazuha becomes frustrated when she keeps getting Heiji's voice mail whenever she tries to call him while she waits for him inside Miracleland.
Kazuha reveals that Heiji was the one who invited her to Miracleland with him, but told her that he had to take care of something for work first.
After the case is solved, Heiji is seen standing right next to Kazuha and smiling.
Heiji and Kazuha ride the Super Snake Roller coaster together and Kazuha teases that Heiji didn't bring his extra pair of pants. Angering Heiji and making him ask why he would need them.
Kazuha teases that if Heiji was scared then he didn't have to raise his hands, making Heiji proclaim that he isn't scared but he wasn't going to put his hands up either.
Kazuha, not realizing that Heiji is freaking out about the leftover wristwatch bomb on Genta's hand, laughs that Heiji is overreacting a bit much.

Movie 13: The Raven Chaser

Heiji and Kazuha together during class

Kazuha runs up to Heiji and asks who he is talking to, surprising him and making him lose his balance. Causing him to fall and making Kazuha believe that he fell completely out of the building.
Heiji tells Kazuha that she scared him and that she almost killed him, making Kazuha apologize for frightening him.
Kazuha teases that Heiji must be talking to someone important and Heiji calls her an idiot and tells her that he's talking to Shinichi.
Heiji apologizes to Shinichi and tells him that Kazuha is poking her nose into other people's business again while smiling at her.
When Kazuha interrupts Heiji's conversation with Shinichi again, he stops everything and listens to her speak with an annoyed look on his face.
Heiji tells her to go by herself if she wanted to go to the Chinese Valentine Celebration while shooing her away with his hand to give him some space.
Kazuha starts to plea with Heiji to go with her to the Celebration even if they left on the same day and didn't stay at a hotel to spend the night.
Heiji replies with an annoyed face that he wouldn't stay at a hotel even if she suggested it because of a fire that happened last year.
Kazuha calls Heiji stingy with a pouting look on her face.
Kazuha asks where Heiji is going and he tells her to tell the teacher that he left to find Weaving Maid at the Vega Hotel. Causing Kazuha to become confused at his statement.

Movie 14: The Lost Ship in the Sky

Heiji and Kazuha are seen having a fun time together.
When asked by Satoshi Kawaguchi if the two were a couple, both teens blushed and vehemently denied being one.
Kazuha tells Heiji to be careful when he goes to help with the hijacked blimp, and he promises he will.

Movie 17: Private Eye in the Distant Sea

In order to evade policemen in a park, Heiji puts an arm around Kazuha and pulls her closer to him, to pretend that they're just a couple on a walk, causing Kazuha to blush.
Heiji saves Kazuha from almost getting shot by a bullet; when the danger is over, Kazuha begins to tear up because Heiji got hurt because of her, with Heiji asking her not to. It fails, and Kazuha cries and hugs Heiji; he tells her it hurts, despite smiling.
When talking to Conan about the case, Kazuha is holding up Heiji's phone, since the detective is having his injury tended; Kazuha is still upset, but Heiji affectionately pats her head, telling her it's alright. Then, Kazuha begins crying again and tackles Heiji.

Movie 21: The Crimson Love Letter

OVAs

OVA 2: 16 Suspects!?

Heiji yelling into Kazuha's ear

Heiji tells Kazuha to bring her ear closer so he can whisper something to her. She blushes and does so, ending in him calling her an idiot.
Ran teases Kazuha about thinking about her and Heiji having a wedding.
In the credit scene, Heiji and Kazuha are seen doing karaoke together.

OVA 9: The Stranger from Ten Years Later

Heiji and Kazuha's reaction when a reporter inquired when they will be married

Heiji is being interviewed on TV when Kazuha suddenly appears. They argue briefly, and the reporter asks them when they'll get married, shocking them both briefly into silence while blushing.

Magic File 4: The Osaka Okonomiyaki Odyssey

Kazuha and Heiji finally eating Okonomiyaki after a long day of running around.

After Heiji wakes up Conan, Heiji calls Kazuha to inform her that they're heading out to the Okonomiyaki Restaurant to eat and to meet him at their usual place at 11:00 with an affectionate scold to not be late.
Kazuha tries to stop Heiji from hanging up the phone, but Heiji smiles as he hangs up on her.
When Heiji and Conan leave the house, Heiji tells Conan that if they're late then Kazuha is gonna chew them out.
After Heiji and Conan finally arrive at the station, Heiji's relieved to see that Kazuha isn't there yet to chew them out for being late.
With a blush on his face and a big grin, Heiji says that they'll pretend that they were there first at the station and they'll scold her for being late. Conan comments that he has a rotten heart for planning that.
When Kazuha doesn't show up after a few minutes, Heiji gets frustrated and calls her cellphone to ask where she is.
Kazuha answers her cellphone angrily asking where he is and how long he was going to make her wait. With a scared look on his face, Heiji yells back that what she said was supposed to be his line.
Kazuha reveals that she's been waiting at Tomorogi Greenfield for him to pick her up, Heiji yells at her saying that they're not meeting up at Tomorogi Greenfield because they're taking the MRT since he can't fit all three of them on his motorcycle at once.
After Heiji reveals that Conan is with him, Kazuha gets angry saying that despite him telling her not to go visit Ran and Sonoko, he secretly invited Conan to spend the night at his house.
Heiji nervously replies that there's no harm done as he continues on to say that he promised Conan some good Okonomiyaki, but Kazuha angrily cuts him off saying that the harm has already been done and she calls him a black octopus.
Conan tells Heiji that he should wrap up his call with Kazuha and have her meet them at the station since they're wasting time, Heiji agrees and tells Kazuha over the phone that they'll talk later and to hurry over to the station.
Conan goes on to explain that Heiji and Kazuha have two places that they meet when they go out together: if they're taking the MRT they go to Neyagawa Station and if they're riding Heiji's motorcycle they meet up at Tomorogi Greenfield. Since Kazuha thought that they were taking Heiji's motorcycle, she thought they'd meet up at Tomorogi Greenfield instead of taking the MRT at Neyagawa Station.
Heiji confirms this with a smile, replying that it's always been the same pattern whenever they go out to eat Okonomiyaki together. After his statement though, Heiji gets embarrassed about his dating habits with Kazuha as Conan smiles.
When Kazuha finally comes up the escalator, Heiji greets her affectionately saying that she finally made it there. Kazuha angrily replies that it's his fault for not being clear with her on where they were going to meet up.
Before a fight could start between Heiji and Kazuha, Conan comes between them and greets Kazuha as he asks if she'll be eating with them since he missed her. Kazuha happily replies that she will and that she's been wanting to see Conan as well. With a happy hop to her step, Kazuha tells Heiji and Conan to come with her as they finally head onto the MRT.
Heiji states that Kazuha's mood changed really quickly and Conan replies that it was his fault that she was in a bad mood to begin with.
While they're riding the MRT, Heiji and Kazuha are having a light hearted conversation as they smile at each other.
When they finally arrive at Yodoyabashi station, Heiji turns towards Kazuha and tells her that they should take the elevator while Kazuha replies back that they should take the stairs instead.
After Fangirls come up to Heiji to ask for an autograph, Kazuha jealously states that he sure is fluttery around them.
Kazuha tells Heiji to calm down after he gets angry at one of the High School boys for saying his father was the real one who solved the case and tells him that they're just jealous of him.
When Kazuha is confused about the 2nd riddle, Heiji explains that the three numbers relate to each other since they're all prefectural buildings in the Mie, Shiga, and Okinawa prefectures respectively.
Heiji smiles at Kazuha as she helps him explain why Miyata Mayumi is the criminal to the High School boys who were testing them.
After proving that Heiji isn't a scammer, Kazuha tells Heiji that they should go with Heiji agreeing and following her after checking the time.
While waiting for the light to turn green the first time, Heiji and Kazuha stand very close together and they stay close together before they stop to help an old man who falls down.
During the second wait time to cross, Heiji and Kazuha smile at each other.
When they finally cross the crosswalk, Kazuha smiles at Heiji after he asks why it took them a whole 10 minutes to cross the street.
Heiji and Kazuha walk side by side very closely as Heiji declares that there isn't a single place in Osaka that he hasn't explored yet in search of the best Okonomiyaki as he playfully asks Kazuha if he's right. To which Kazuha replies that he's just an idiot.
Heiji looks at Kazuha with a shocked expression on his face as she accepts to watch the baby for the mother. After the mother leaves, Heiji tells her that they only have 20 minutes to eat lunch at the Okonomiyaki restaurant.
When Kazuha comments that Kaoru is a girl with a happy tone, Heiji replies that's obvious since the baby is wearing all pink but he stops in the middle of his sentence after he watches Kazuha interact affectionately with the baby.
Heiji smiles as Kazuha as she affectionately bounces the baby up and down, saying in a soft voice he comments that she's really good at taking care of babies.
Kazuha smiles at this compliment saying that Satoshi used to come over to her house as a baby to play as she says to the baby that she's cute.
Out of nowhere, Kazuha tells Heiji that she wants a baby. Causing Heiji to blush and to call her an idiot as he tells Conan to shut up, who is laughing at the expression on Heiji's face and Kazuha's statement.
When the mother is late, Kazuha gives the baby over to Heiji telling him that she's gonna go check on her and to not make the baby cry while she's gone.
When Kazuha comes back, she scolds Heiji for making the baby cry when she told him not to. Heiji defensively replies back that he couldn't help it if she cried or not as he hands the baby back to her.
After Kazuha calms Kaoru, she tells Heiji that the mother wasn't in the bathroom and Heiji starts to ponder if the mother had abandoned Kaoru to them since she looked to be only 20 years old. To which Kazuha explains that couldn't be the case before Kaoru started to cry again.
Kazuha tells Heiji that she's going to change her diaper and that he needs to take out a fresh diaper and some wet wipes for her. Heiji complies and hands over the baby supplies to Kazuha as she starts to change Kaoru's diaper.
After Kazuha takes off the diaper, she informs Heiji that Kaoru is actually a boy. Shocking Heiji and Conan as they lean over to see for themselves.
Heiji goes on to explain to Kazuha that Kaoru could've been kidnapped by the lady who gave him over for them to watch since she didn't know how to properly dress the baby up as a boy.
After Heiji, Kazuha, and Conan solve the mystery of the baby Kaoru, Heiji says to Kazuha that nothing beats a happy ending and that he may have read to deeply into the situation. Causing Kazuha to yell at him calling him a crime maniac. But Heiji retorts saying that it was her fault in the first place for agreeing to watch over the baby to begin with. They start having one of their married couple arguments.
Heiji and Kazuha jog in place and look at each other as a depressed Conan sighs about missing out on his lunch.
Heiji and Kazuha wave Goodbye to Conan as he leaves with the rest back home to Tokyo with guilty looks on their faces.
Heiji and Kazuha have a good time together as they eat Okonomiyaki, but Kazuha feels guilty and comments that Conan should be starving by now. Heiji tells her that she shouldn't worry about him since he's probably eating on boxed lunches on the train back home.
Laughing together, Heiji and Kazuha continue to eat their Okonomiyaki joyfully.

Opening Themes

Opening 7: "Mysterious Eyes"

Kazuha is seen chasing Heiji in their school uniforms.
While Kazuha is chasing Heiji, Heiji is smiling at her attempt to catch him.

Opening 10: "Winter Bells"

Both Heiji and Kazuha appear in the opening together.
During the final scenes of the opening, Heiji and Kazuha are seen smiling together for a picture.
When we see the final group shot of all the photos we see in the opening, Heiji and Kazuha continue to be in a close proximity to each other.

Opening 12: "Kaze no Lalala"

Heiji and Kazuha appear together at the very end of the opening when a giant group photo is being taken of the main characters.
Heiji appears to be holding onto Kazuha's arm while he waves at the camera to get them noticed in the shot.
Heiji and Kazuha share the same facial expressions during the photo.

Opening 13: "Kimi to Yakusoku Shita Yasashii Ano Basho Made"

Heiji and Kazuha are riding on the former's motorcycle.
At the opening's end, they can be seen close together, with Kazuha's hand on Heiji's shoulder.

Opening 14: START

Kazuha appears right behind Heiji with his signature hat on her head as she holds onto his shoulder with her hand.
Kazuha has a brief little scolding session with Heiji over something before she turns her head towards the camera angle with a smile.
Heiji appears to be sweating a little bit from her short scolding session and then looks at her annoyed because of her happy go lucky attitude.
In the final shot of the main cast, we see that Kazuha and Heiji stand close together and Kazuha still has his hat on her head.

Opening 16: "Growing of my heart"

Kazuha and Heiji appear doing their signature sporting activities: Kendo and Aikido.

Opening 18: "100 Mono Tobira"

Kazuha and Heiji appear in the same moment with Sonoko.

Opening 20: "Namida no Yesterday"

When Heiji appears on screen, Kazuha pushes him aside in order to get the spotlight for a few seconds before it's taken away again.
Heiji looks annoyed at Kazuha pushing him aside with her hand.
Kazuha and Heiji are cheering during a volleyball game and are seen standing very close to each other with Heiji in front of Kazuha.
Both are smiling together when it seems like they've scored a point.

Opening 21: "Glorious Mind"

Heiji is frightened when Kazuha randomly shows up in front of him to take the spotlight on herself.
Kazuha smiles at Heiji's frightened reaction and smiles at the camera when it's her turn to be shown on screen.

Opening 23: "Ichibyōgoto ni Love for you"

Heiji and Kazuha are back-to-back together when they are introduced on screen.
Kazuha is the one to lean against Heiji's back with a smile on her face, though Heiji has an annoyed look when she does this.
Doves fly away when they are shown back-to-back together.

Opening 24: "Mysterious"

Kazuha and Heiji both appear side by side.
They share an equally determined look on their faces as they gaze off into the camera with signature smiles on their faces.

Opening 25: "Revive"

Heiji and Kazuha are once again introduced side by side together and smiling.
Kazuha is wearing Heiji's signature hat.
At the end credits, we see Heiji and Kazuha closely together for the final shot of the opening.

Opening 26: "Everlasting Luv"

Heiji and Kazuha smile side-by-side together with their signature smiles.
Their twin good luck charms are shown right in front of them, signifying their deep history and childhood together.
Heiji and Kazuha are shown at the very end of the song being side-by-side with smiles on their faces.

Opening 27: "MAGIC"

Heiji is seen running with Conan (Shinichi) away from Kazuha and Ran from what looks like a group outing.
Kazuha calls out for Heiji to come back, but smiles at Kazuha at the funny habits of their boyfriends, since Conan is Shinichi.

Opening 28: "As the Dew"

Heiji and Kazuha are shown in Osaka in their sporting gear.
Heiji and Kazuha both smile at the camera with pride.

Opening 29: "SUMMER TIME GONE"

Heiji and Kazuha are seen together, presumably talking, until they both look up into the sky.
Heiji and Kazuha both eaves drop on Shinichi and Ran as they are calling each other, both teasing about their love lives in an affectionate manner.
At the end of the opening, Heiji and Kazuha are seen smiling and standing next to each other.

Opening 31: "Don't Wanna Lie"

Heiji is in front of Kazuha and they are both smiling simultaneously together at the camera.

Opening 32: "Misty Mystery"

The scene from when Heiji is hanging onto Kazuha from a tree branch, when they nearly fall from a cliff is used. Then, they are both shown to be lip-syncing to a lyric of the opening.

Opening 33: "Miss Mystery

Although being almost negligible, they two appear during the scene of the floating screens together with a yellow background.

Opening 35: "TRY AGAIN"

Kazuha appear behind Heiji and they two are smiling to the camera with an orange background.

Opening 38: "Greed"

During the Osaka section of the opening, we see Kazuha and Heiji grouped up together in close proximity to each other.
Heiji and Kazuha are both smiling together at the camera as they do their individual poses next to each other.

Opening 40: "WE GO"

Kazuha holds onto Heiji's shoulders as they are surrounded by numerous silhouettes.

Opening 47: Countdown

Heiji embrace Kazuha while both are hiding to get out of the rain.

Ending Themes

Closing 14: "Yume Mita Ato de"

Kazuha and Heiji are shown standing underneath a fully bloomed cherry blossom tree together smiling.

Closing 20: "Wasurezaki"

Kazuha is standing behind a crouching Heiji, with her hands on his shoulders.

Closing 21: "June Bride ~Anata Shika Mienai~"

A child Heiji and Kazuha are seen briefly, both running in the opposite direction of a young Shinichi and Ran.
Heiji is teasing Kazuha by holding a baby snake, and Kazuha is trying to get away from him.

Drama Episodes

Drama TV Special 4: Shinichi Kudo and the Kyoto Shinsengumi Murder Case

Kazuha smiles warmly while watching Heiji do his role.
After the accident on the shoot, Kazuha stays at Heiji's bedside, and calls out his name with worry in her voice. She then grabs his hand, with the omamori locket in her hand.

File. 9

Kazuha notices Ran watching Heiji very closely.
A jealous Kazuha confronts Ran forcing Ran to explain herself. Thankfully, Ran explains she was watching Heiji because he reminded her so much of the guy [Shinichi] she thinks about.
Kazuha explains the story to Ran about how she and Heiji were accidentally handcuffed to one another when they were little and shows Ran the piece of the chain she keeps as a lucky charm. Ran asks if she and Heiji are dating but Kazuha, embarrassed, remarks that she thinks of herself as more of an older sister to Heiji.
Sato teasingly warns Shinichi and Heiji to be careful with their bonds towards Ran and Kazuha, respectively.

Gallery

For the full gallery see: Heiji Hattori and Kazuha Toyama/Gallery

Trivia

Fans of the Heiji-Kazuha pairing sometimes refer to them as "KazuHei" or "HeiZuha."
In most openings and endings, they have appeared together.
Heiji and Kazuha are referred to as the Shinichi and Ran of Osaka.
They are the 2nd couple to be introduced as childhood friends who became something more.
Much like Shinichi with Ran, Heiji is deadly afraid of Kazuha's anger.
Heiji and Shinichi often talk about their relationships with their "girlfriends" much like Kazuha and Ran do about their "boyfriends".
Though Heiji was introduced in Conan's arc, Kazuha was introduced in Sherry's arc.
- This is similar to Wataru Takagi and Miwako Sato, in which, the boy (Heiji/Takagi) was introduced in Conan's arc and the girl (Kazuha/Sato) was introduced in Sherry's arc.
Heiji and Kazuha's relationship is similar to Kogoro and Eri's, as both pairs are childhood friends, who fall in love with each other, and fight/insult each other a lot to hide their true feelings towards each other.

References

^ ^a ^b Manga Volume 19: Files 185 (Stabbed Wallet Case)
^ ^a ^b Manga Volume 28: Files 283 (Mermaid's Curse Case)
^ Manga Volume 31: Files 317 (Tiger Scroll Case)
^ Manga Volume 83: Files 881 (Drug Trading Case)
^ Manga Volume 86: Files 912 (Kamaitachi Murder Case).

[StabbedWallet-1] Manga Volume 19: Files 185 (Stabbed Wallet Case)

[Mermaid.27sCurse-2] Manga Volume 28: Files 283 (Mermaid's Curse Case)

[TigerScrollCase-3] Manga Volume 31: Files 317 (Tiger Scroll Case)

[DrugTrading-4] Manga Volume 83: Files 881 (Drug Trading Case)

[KamaitachiMurder-5] Manga Volume 86: Files 912 (Kamaitachi Murder Case).

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