Mahou Sensou

Nanase Takeshi is an ordinary high-school student with a slightly traumatic past and a strong concern for what others think of him. Though he is dating his childhood friend, Isoshima Kurumi, he otherwise leads a fairly normal life. That changes when Takeshi finds Aiba Mui, a girl in an unfamiliar uniform, collapsed on his school grounds. Her appearance ushers in a series of strange incidents. Mui tells him that she is a magic user—and that she has turned him into one as well.