A boy dies trying to save a girl and wakes up undead in her monster army, fighting her siblings' supernatural assassins for a crown he'll never wear. The show treats this premise with absolute seriousness for about three minutes, then commits entirely to the bit: grotesque horror and genuine action wrapped in deadpan comedy that never breaks character to explain the joke. You're watching a supernatural tournament arc where the prize is survival and the cost is your humanity, one resurrection at a time.

Hiro Hiyorimi comes to the city to live with his sister Sawawa, and on the way he saves a girl in Gothic clothes from falling construction beams, losing his own life in the process. His reward is resurrection as an undying servant bound to Hime, a princess of the Monster Realm locked in a deadly succession fight against her siblings. Now Hiro must defend her from the creatures those siblings keep sending after her. Hime's siblings don't send typical assassins. Instead, Hiro faces off against vampires, zombies and creatures so ridiculous they blur the line between horrifying and hilarious. A were-shark. A murderous dumpling. A panda. The tone swings between horror and absurd comedy. For all her menace, Hime may be the closest thing to a good person in this royal feud, and survival means fighting alongside her.