Kämpfer Volume 1

is the first volume of the Kämpfer light novels.

The plot revolves around Natsuru Senō, a normal high school boy with blue hair who wakes up to find he's turned into a girl! A stuffed tiger, named Harakiri Tora, comes to life and tells him to fight as a female fighter Kämpfer. Having no idea about what's going on, Natsuru gets involved in many battles against other female Kämpfer.