Long long ago, the great Bodhisattva of Japan, Ozunu Enno, controlled the Demon Gods to defeat the Demon Goddess Karuma. After Karuma's defeat, he sealed away one of his Demon Gods, Zenki, in a pillar until needed again.

Centuries later, his direct descendant, a school girl named Chiaki Enno is able to free Zenki, although the fierce demon lord currently has the form of a bratty demon child. To transform this extremely defiant demon into the form that made him useful by her ancestor, she uses a bracelet that appeared on her wrist when servants of Karuma broke the seal that imprisoned a seed of Karuma. Zenki reawakens because the seeds of Karuma start appearing and turning people into monsters and Zenki is needed again to eradicate this menace.