Kousuke encounters the goddess Fauna after she appears with the intent to eliminate the evil force dwelling inside him. Choosing a different approach, she enlists her older sister Jordh to perform a series of intimate rituals meant to suppress the demon’s influence. At the same time, the little devil Natsuki begins advancing her own schemes, stirring new complications. As Kousuke navigates these unexpected alliances, the line between his everyday life and the recurring nightmare grows increasingly thin.