Nakajima Octopus Friends

Gouzaburou Seto is the head of the Seto Yakuza Group. His greatest loves are for his wife, Ren; and cute, cute daughter San Seto. He joined Isono Junior High School as San's home room teacher.

Maki the "Spiral Shell" is a member and assassin of the Seto Group. Standing at only a few inches tall she's still very deadly with her shell machine gun. She's fiercely protective of San Seto.

Masa-san is the afro cool guy of the Seto Group. He joins Isono Junior High School as the math teacher to watch over San Seto and Nagasumi Michishio.

Ren Seto is San's mother, a mermaid, and the only one who can keep her husband Gōzaburō in line. She joined Isono Junior High School as the school nurse to watch after San and Nagasumi, but more to keep her husband in check.

Shark Fujishiro is a member of the Seto Group. He joined Isono Junior High School as the PE Teacher. He is a shark style mermaid.

Sun Seto is a mermaid and the daughter of a Yakuza boss of the Seto Crime Family. She lives her life by the way of chivalry. She's engaged to be married to Nagasumi Michishio.