Sun Michishio
Sun Seto
Name in Japanese 瀬戸 燦
Debut (Anime) Episode 1
Debut (Manga) Volume 1
Appears in Anime, Manga
Voice Actor (Japanese) Haruko Momoi
Voice Actor (English) Alexis Tipton
Personal Info
Gender Female
Age 14
Race Mermaid
Affiliation Isono Junior High School

Sun Seto (瀬戸 燦 Seto San?) is the main female protagonist of the story. She is also the wife of Nagasumi Michishio, thus making her Sun Michishio.


Sun has long tan hair that goes past her waist with bangs. She has fair skin with light brown eyes and has a above average figure with a relatively large bust.


Sun is a calm, average, smart girl for her age and most likely the only one in her family who has a clear head.

Powers and Abilities

When push comes to shove, Sun demonstrates a great deal of inner strength. Sun often uses her Song of Heroes to power Nagasumi up in battle situations. She has shown a great deal of swordmanship, which she was taught to by Masa.


She decided to face her fears and take on the responsibility of taking care of Nagasumi as her husband, although it doesn't make it easy on her due to almost everyone in the Seto group (except her mother and Masa) who are against their union. As the series progresses, however, she truly falls in love with Nagasumi.