八島 聡美

Fighting Style: Kyokushin Karate.
Birthplace / Origin: Tokyo.
Occupation: 3rd-year (senior) at city academy "T", part-time waitress (Bikkuri Monkey).
Likes / Loves: Effort, her little brother Daisuke.
Dislikes / Hates: Poverty, betrayal.
Hobbies: Cooking, training.

A young woman who lives with her younger brother, Daisuke. Their parents died when they were kids. She earns money for living expenses and school tuition by working part-time jobs while caring for Daisuke. While she is an honest, straightforward person, she is also practical and realistic when it comes to situations involving money. This is because they have no other living relatives to provide for them, Satomi is often forced to take various odd jobs simply in order to make ends meet.