Motoko Gettou looks like an ordinary high schooler, but a childhood of brutal training under three martial-artist foster fathers split off three more personalities, Hibiki, Fujiko, and Mikiri, who together call themselves HiFuMi. Each surfaces when Motoko is in danger, each fights in a different style, and her classmate Teruharu Kosukegawa is the only person who knows. Iku Sakaguchi and Shiuru Iwasawa's manga keeps the two of them guarding the quiet school life Motoko wants to hold on to.