A Satan cult, whose leaders are demons in human form, begin to hold a series of Black Masses in hopes of reviving an ancient demon known as Dante. Ryo Utsugi, a high school student, begins experiencing strange nightmares and premonitions. Soon after, Ryo's sister, Saori, is kidnapped by these cultists for use in one of their sacrificial ceremonies. Ryo's premonitions guide him to the ritual and he saves her right before it is disrupted by a group of militant Christians. Believing that Ryo's new-found powers could awaken Dante, the cultists orchestrate a chain of events to lead Ryo to the mountains, where he discovers a portal that takes him into the deepest parts of the Himalayas, the heart of Dante's prison.