Infinite Stratos (2011)

Girls from all over the world gather at IS Academy to learn how to become IS pilots. However, since the protagonist, Orimura Ichika, can somehow pilot the IS even though he is male, he was forced to attend IS Academy as well. As the only male in this school attended by girls of all shapes and sizes from around the world, including his childhood friend and kendo buddy, Houki, tempestuous action battles and romantic encounters await him.