Plot summary:
The story revolves around Natsuru Senō, 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". Having no idea about what's going on, Natsuru is involved in the battles against other female Kämpfer.
Well, that's what Wikipedia says anyway.
Personally, I would describe this as "chicks that fights, genderbending, yuri and most likely a sorry excuse for a plot."
[staff] topic edit because I don't want any complaints about not being able to find this thread >_>