Owari no Seraph: Nagoya Kessen Hen

Following the eradication of all adults by a virus, vampires appeared on Earth to control the surviving children, considering them as livestock. Yuichiro Hyakuya survived with the other orphans by giving his blood to the vampires, until his escape 4 years ago. Since then, he has become a member of the Moon Demon Company, a unit of the Japanese army, with the goal of hunting the vampires responsible for the death of his family.