Kämpfer is a 2010 fantasy/action film directed by Paul W.S. Anderson, the director of Mortal Kombat, Mai the Psychic Girl, and Death Race. Rupert Grint stars as a normal high school student who becomes a girl one night after being drafted as a Kämpfer (because you have to be a girl to be in your Kämpfer form), and Emma Watson stars as his bespectacled sidekick.