The delta wetland shrouded in gray fog has become a purgatory for human survival - the "Rule Zero" here uses life as a bargaining chip: those who complete the task will receive supplies, and those who violate the rules will be assimilated by the "rules".
Hangzi and Abao were reborn before the end of the world, but they broke into the Delta restricted area due to an accident. They witnessed the former survivors transform into twisted "rule enforcers" and met the mysterious General Kashiwa in a desperate situation. The shadow of the betrayal of old friends has not gone away, and new rules and traps are approaching step by step. The two rely on tacit understanding to break through the battle for supplies and the hunt for mutants, but they discover that behind the "no survivors" rule lies the truth that human civilization has been tampered with. They must tear apart the camouflage of Delta before the rules completely swallow them up.
