Gentle Motoko seems like a regular high school girl, but years of martial arts training has left her with a rather unique problem: she has three split personalities, collectively known as the HiFuMi. Hibiki is the first personality, an impulsive tomboy and karate expert who takes over when the going gets tough. Fujiko is a cool-headed strategist who never makes a rash decision when sizing up her enemies. And Mikiri is a bubbly judo master who loves food and has trouble keeping her huge breasts inside her clothes. All four personalities have taken an interest in young Teruharu.