Kumi Amasu

She's a kindhearted and a little naive girl who trusts people easily, but has a strong will. She transfers to Amazon Academy to find out who killed her sister. After coming to the school she makes friends with Burai Sachiko, two-faced Hinata Mineko and Sasarano Sara. She has one badge and tries hard to not let others steal it from her. She is protected by Burai, who was her sister's friend.