Senou Natsuru is your normal, everyday high school student. However he´s been chosen to be a Kampfer, who´s objective consists on fighting other Kampfer with either guns, swords or magic, however, there´s catch; first you can´t chose if you´re a Kampfer or not, and second, you must have the body of a girl to use your powers.Tsukiji Toshihiko is the author of both the manga, which is 3 tankoubon long so far, and the novels, which is still going after 13 books long. The novels have half-numbers, so 13 total have been released so far, but book 10 1/2 was the last to be released (bottom pic). Semmu is the illustrator for the books and also the manga. Tachibana Yuu also does art for the manga. Both series are published in Japan by Media Factory.