IS: Infinite Stratos is a Japanese light novel series written by Izuru Yumizuru. It is set in a world where exoskeletons called Infinite Stratos (IS) can only be piloted by women, with one exception: a Japanese boy named Ichika Orimura. The series explores Ichika's experiences at an all-girls IS academy as he navigates relationships and battles. It blends elements of science fiction, action, and harem genres.