Tenshuro lives as a straggler in the village of Nekomata. Tonight, as he completes his coming-of-age-ceremony, his destiny will change drastically. To maintain peace in the village, his childhood friend Omomo is sacrificed to a "natural disaster" called Nekobaba-sama. In order to save her, whom he had vowed to marry when she was a child, Tenshūro releases the cursed power that lies in his own blood. In order to save her, Tenshuro releases the cursed power that lies in his own blood, the power of the dreaded "Shuten Doji," which his own brother had once unleashed and killed his entire family.