Mawari Zenigata 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.

The riches boy in all of Japan due to his father's Mikawa Corporation. Kai Mikawa ses himself as a rival to Nagasumi for San. He is a severe agoraphob. He is a killer whale style mermaid.

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.

Nagasumi is a young boy who nearly drowned while on vacation. He was saved by a mermaid, San Seto; and due to mermaid law they must either marry or die.

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.