When a deceased serial killer becomes employed by a powerful demonic entity, he is given the duty of harvesting innocent souls where they are taken and imprisoned in the Dark Realm to be fed upon. After befriending the spirit of a young girl who had been murdered fifty four years earlier, Sage Fitzgerald is taken to the spirit realms through a mirror portal where she is shown a beautiful inter-dimensional world as well as a grim reality. Determined to destroy the malevolent entity who had possessed and killed countless people in her hometown, she is granted an indestructible legendary weapon by a mysterious old witch where she must face the dark abyss and challenge one of the world's greatest foes.