Senou Natsuru is a normal high school boy. One day he wakes up to find himself turned into a girl. A stuffed tiger "Harakiri Tora" comes to life and tells him to fight as a female psychic fighter "Kämpfer...

Konoe Subaru, a classmate of Sakamachi Kinjirou, has been serving as the butler of Suzutsuki Kanade in school. Due to an accident, Sakamachi discovers Konoe's secret...that he is actually a she!? Apparently she...