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 makes a fatal mistake when he tries to rescue a girl from an oncoming truck, sacrificing his own life in the process. His reward for this noble act: resurrection as an undead servant bound to Hime, a monster princess locked in a deadly succession war against her siblings. Now caught between the living and the dead, Hiro finds himself thrust into a supernatural battlefield where he must defend Hime from increasingly bizarre assassination attempts orchestrated by her power-hungry family members. What starts as a straightforward bodyguard scenario spirals into something far stranger. Hime's siblings don't send typical assassins. Instead, Hiro faces off against possessed corpses, bloodthirsty creatures of legend, and creatures so ridiculous they blur the line between horrifying and hilarious. A were-shark. A murderous dumpling. A panda with a taste for violence. The tone ricochets wildly between grim horror and absurdist comedy, never settling long enough to feel predictable. Hiro quickly realizes that Hime, despite being a monster princess, might actually be the only decent person in her entire family. Survival means learning to fight alongside her, even as he grapples with what he's become and whether undeath was really a fair trade for heroism.