Kämpfer (ã�‘ã‚“ã�·ãƒ•ã‚¡ãƒ¼ KenpufÄ�)is a Japanese light novel series.  Natsuru SenÅ�, a normal high school boy with blue hair. One day he wakes up to find himself turned into a girl. A stuffed tiger "Harakiri Tora" comes to life and tells him that he has been chosen as one of the "Kämpfer", a female fighter. The Kämpfer are destined to fight with other Kämpfer. The story starts when he is attacked by an unknown girl who happens to also be a Kämpfer.