Hundred - S01

When an alien life-form called "Savage" begins attacking humanity, the only weapon effective against them is a system known as "Hundred." Hayato Kisaragi, a young survivor of a Savage attack, has an unusually high compatibility with this technology and is recruited to train at Little Garden, an elite military academy housed on a battleship. During his rigorous preparation for the coming war, Hayato quickly catches the attention of several female classmates and becomes entangled in various conflicts while fighting to protect Earth from the invading creatures.