Seraph of the End

In a world ravaged by a mysterious virus that has decimated humanity, only children under the age of thirteen remain untouched. But their reprieve is short-lived, as vampires emerge from the shadows to enslave the surviving youths, offering them "protection" in exchange for their blood. Among these captives is Yuichiro Hyakuya, a spirited orphan who dreams of a brighter future beyond the vampires' gilded cages. When a tragic escape attempt leaves Yuichiro as the sole survivor of his chosen family, he vows to exact revenge on the creatures who stole everything from him. Now, enlisted in the Japanese Imperial Demon Army, humanity's last bastion against the vampiric hordes, Yuichiro must navigate a treacherous world of supernatural powers, uneasy alliances, and the dark secrets that lie beneath the surface of both sides of the conflict.

✦ AI-drafted summary