Dead Mount Death Play

A legendary hero confronts the Corpse God in what should be the final battle against a powerful necromancer. Instead of accepting defeat, the Corpse God casts a reincarnation spell and escapes into another world. There, the boy Polka Shinoyama awakens with a presence inside him that has no place in an ordinary modern life. Surviving the transition means understanding unfamiliar people, dangers and rules while carrying powers from a very different existence. This reverse-isekai thriller turns a fantasy ending into a new beginning, bringing necromancy into an urban setting where the distinction between monster and human quickly becomes complicated.