In a world where elves, dwarves, and invisible dragons live in harmony inside a metropolitan city, Sieg sets out to find someone or something that can unleash the curse that he carries on his back. As he attempts to survive in the city of Jinbocho, a city filled with fantastic secrets and organizations, he encounters many powerful individuals who set out to either destroy him or save him. Will Sieg be able to discover the true secret of his curse, or will it lead him to his own demise?

Volume 1 contains the original one-shot as a prologue chapter.