Mio is a first year student at Kuromi Girls 'Academy. She excels at fighting games and attends the academy at her mother's request. Mio is addicted to fighting games and doesn't hesitate to break the rules of the academy to play. She cries easily when things don't go her way, but shows strong determination when she has a goal in mind. Fellow students call her Shirayuri-sama, a nickname that infuriates her.