Kaibutsu Oujo

Hiro dies trying to save a young woman from an accident, then wakes to discover that she has restored him to life. His rescuer is Hime, a princess of the monster realm, and his continued existence now binds him to her service.

Hime’s royal siblings are competing for the throne, making her household a target for deadly visitors. Surrounded by unusual allies and creatures sent to attack his mistress, Hiro must adjust to a role he never chose. Being brought back from death is only the beginning of his problems.