The protagonist Chloe wakes up with a decade of lost memory and is mistaken for the wife of Lucas, the leader of the Paranoia Base. By chance, she discovers a diary revealing that Sophia—who had assumed her identity—had been imprisoned for years. Pretending to comply, she investigates the base's layout and escapes in perilous fashion. During her flight, she evades pursuers and reaches the peaceful Dawn Base, only to be forced to bear the blood debt left by Sophia's crimes. Lucas arrives accompanied by the controlled Sophia, exposing the conspiracy behind the Doomsday Redemption System: a scheme to replace identities and destroy the world. Overcoming their differences, the three awaken their superpowers, journey back to the old base to destroy the system's core, and embark together on a path toward rebuilding the post-apocalyptic world.
