A man named Caiman is searching for his real identity after a transformation by a sorcerer left him with a reptile's head and no memory of his former life. Along with his friend Nikaido, he violently assaults sorcerers in the Hole, with the aim of taking their heads into his mouth, where a strange face appears from his throat and judges whether the sorcerer he has bitten onto was the one responsible for his transformation or not. Somehow, Caiman is immune to magical effects and as a result