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Kosukegawa is a very shy young otaku. One day, he falls in love with Motoko Gettô, a girl in his class, who seems perfectly normal... but who suffers from a split personality! Indeed, when she finds herself in trouble, she gives way to "HiFuMi", three very devastating personalities: Hiromi, an expert in wrestling and combat, Fujiko, a master of strategies and all kinds of weapons, and finally Mikiri, an expert in "submission" techniques (strangulation, arm locks, etc.) and close combat. How will the relationship between Motoko and Kosukegawa evolve?