"What did the guy inside tell you?" In a post-apocalyptic future, two completely different populations live side by side in a gloomy universe. In the world of the "mages", they have the ability to make passages appear and indulge in the pleasures of mutation on guinea pigs, who live in "Hole", the haunt of the unfortunate mutilated victims. Caiman, who hasn't always lived with a lizard's head, loves his friend Nikaidô's gyozas and is determined to find the person who gave him his current appearance. A major asset in his favor is that he remains impervious to the magic of the "mages", which does not please them at all.