Guy, a summoner, inherited an ancestral coat in which a magic circle was carved. Sealed in it is Sakim, the moon’s divine beast. Guy, who lost all of his family when he was very young, became Sakim’s master through a contract, and together they travel around. A bloodstained forest full of wolves, a night street where a will-o’-the-wisp showed up, a port city where Guy got possessed by something, a swamp where the dead gushed forth… Each time he encounters a mystery on the road, Guy borrows Sakim’s power. And as compensation, he’s held by Sakim. Guy’s heart was closed as if he’s been imprisoned by thorns, but before he knew it…