Yuusha ni Haiboku Shita Maousama wa Kaerizaku tame ni Mamonogirudo o Tsukuru koto ni Shimashita.

The Demon King has had a rough day. Just when he thought he finally defeated the hero, he came back. And back. And back. And sooner or later, the hero who constantly resurrected was bound to defeat a Demon Lord who couldn’t.