The game is set in a fantasy version of ancient Japan that is filled with creatures of myth. Ages ago the terrible Kamigui wreaked trail of death and destruction across the land before being stopped by the goddess of the Sun, Amaterasu Oomikami. The goddess places three great Seals that forced the Kamigui to retreat. Now one of the Seals has shattered.

The player character is an Oni whose peaceful life in the Western island of Onigashima is disturbed by the revival of the Kamigui.