The apocalypse arrives through ritual and fog—Su Han and his roommates become unwilling catalysts. The Book of Blood Spirit manifests in every survivor's hands with a singular demand: Contract monsters separate the living from the dead. As civilization collapses around him, Su Han faces a mutated neighbor, fruit knife trembling in his grip. Grotesque fused corpses scatter across ruins. Enormous spiders gape with hunger. Eyeballs consume the city skyline. One-eyed taloned hand monsters emerge from shadows. Cities burn. Humans become hunted. Survival demands a single choice: command monsters to destroy monsters.