Infinite Stratos

The Infinite Stratos (IS) is a powerful exoskeleton weapon developed by Japan that can only be piloted by women. An international agreement prohibits its use in military combat due to its immense capabilities. Ichika Orimura, a 15-year-old boy, is unexpectedly discovered to be the only male capable of operating an IS. As a result, he's enrolled in the Infinite Stratos Academy, an all-female boarding school that trains IS pilots. Chifuyu Orimura, Ichika's older sister and a renowned IS pilot, serves as his strict homeroom teacher.