In the past, Demons and Humans fought a war, requiring special warriors to defend humans. Presently, a peace treaty exists, and Human warriors defend demons from predation by their own kind. The Yosogi family is responsible for this task, and the young heir Akira is ill-equipped for the job. Nonetheless, Akira possesses the unique ability to sense the presence of demons, making him the only suitable candidate for the next Demon Defender. However, their grandfather invites the timid girl Matsuri into the fold, and Akira learns through a dream that he must safeguard her at all costs.
