Ryo Utsugi keeps dreaming of a horned giant sealed inside a Himalayan mountain, and the visions follow him into his waking life in Nagoya. A cult devoted to reviving that demon, Dante, takes his sister Saori for a black mass, and Ryo goes after her only to find out why the dreams picked him. What he becomes puts him between the demons who once ruled the planet and the force humanity has always called God.