Midari is a third-year student and head of the Beautification Committee. Midari wears an eyepatch after stabbing her own eye out to pay her gambling debt to Kirari, but remains loyal to the Student Council when Kirari promised to kill her in the future. She is aroused by violence, and often challenges opponents to increasingly violent gambles where the participants can either be maimed or killed, favoring modified versions of Russian roulette. After Yumeko forces their seemingly deadly game into a bloodless draw, she becomes infatuated with her.
She is typically chained up in a jail cell.