In 1971, a scientific expedition in Latin America had uncovered an ancient artifact containing the remains of the demon Giff, leading to the creation of the Vistamps. In the present day, the remains of Giff now lie in the hands of a demon cult called the Deadmans, who seek to resurrect him by converting peoples' inner demons into their fold. Fenix, a governmental organization opposing the Deadmans, have developed the Revice Driver for someone with complete control over their inner demon..... but something off..