終わりのセラフ

ある日、謎のウイルスが地球上に出現し、感染した13歳以上の人間は全員死亡しました。同時に、世界の暗い奥地から吸血鬼が現れ、人類を奴隷にしました。One day, a mysterious virus appeared on Earth which killed every infected human over the age of 13. At the same time, vampires emerged from the worlds dark recesses and enslaved mankind. Enter Hyakuya Yuuichirou, a young boy, who along with the rest of the children from his orphanage, are treated as livestock by the vampires. Even in captivity, Yuuichirou dreams big. He dreams of killing vampires. He dreams of killing them all.