Nagasumi Michishio Friends

Akeno Shiranui is the mermaid examiner who comes to Isono Junior High School. Her job is to test if a mermaid can blend in with society.

Inchou is the Class President of the Isono Junior High School class of Nagasumi and others. She's a shy girl and no one can seem to remember her real name.

Hideyoshi Sarutobi more often called Saru due to his monkey-like appearance. A hyper and perverted boy. He's a classmate and friend of Nagasumi Michishio. Willing paid-servant to Kai Mikawa.

Lunar Edomae is a mermaid that is best known as the Pop Idol Lunar. She is the daughter of a Yakuza boss of the Edomae Crime Family.

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.

Mawari Zenigata is a head of the discipline committee of Isono Junior High School. Her ideal is to follow in her father's step to become a great police officer. She enforces the "Rules of Society".

Nagasumi's Father is the head of the house of Nagasumi Michishio. Forced to sit back and watch as his son is engaged to a yakuza boss' daughter, San.

Nagasumi's Grandfather was a resident of Seto Inland. He died years ago and now exists in the afterlife.

Nagasumi's Grandmother is a resident of Seto Inland. She knows of the mermaids that live in the oceans, but the family didn't believe her until one came to see Nagasumi.

Nagasumi's Mother is the mother Nagasumi Michishio. Forced to sit back and watch as his son is engaged to a yakuza boss' daughter, San. She has an open desire for Masa-san.

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.

The younger sister of Saru, Nagasumi saves her when a oil tanker crashes into a movie theatre and she is trapped inside.

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.