So we all notice that Anokata's name (or maybe just the name of a member of BO) appeared in the mermaid case, 大黒連太郎 (Ōguro Rentarō), also known as Daikoku Rentaro And these are the names of seven Gods of Luck in Japanese folklore: http://www.kusuyama.jp/blog/shichi-fukujin-seven-gods-of-luck-and-good-fortune/
Daikokuten Bishamonten Benzaiten (the only godness of 7) Fukurokuju Hotei (he is fat) Jurōjin
Ebisu And about BO's members: Daikoku Rentaro - Daikokuten Pisco - Bishamonten Berumotto (katakana of Vermouth) she is a female - Benzaiten Furuya Rei - Bourbon - Fukurokuju Vodka is fat - Hotei Jin (katakana of Gin) - Jurojin
so Ebisu might resemble Rum's name or aliases...?
and seven Gods of Luck, remind me of "Nanatsu no ko" (seven baby crows)