終わりのセラフ

Yuichiro Hyakuya and the other children at the Hyakuya Orphanage live as blood livestock for the vampires who conquered humanity after a lethal virus wiped out most adults. When an escape attempt led by his best friend Mikaela ends in massacre, Yuichiro is the only one to reach the surface alive. Taken in by Lieutenant Colonel Guren Ichinose of the Japanese Imperial Demon Army, he trains to wield a Cursed Gear weapon with a single purpose: destroying every vampire responsible for his family's death.