Natsuru Senou is a completely normal high school student. That is, until he suddenly transforms into a girl warrior with the ability to throw fireballs: a Kämpfer. This gets taken to its natural conclusion, as a stuffed animal (Harakiri Tiger) tells him that he must fight other similarly super-powered girls, just like that. Throw in a few psychotic lesbians, unfortunate misunderstandings and some intense fight scenes. Hilarity ensues!