After the Third World War, nuclear radiation swept across the world. The earth's surface was shrouded in a "rotten mist" and mutated creatures "skeleton beasts" ran rampant. Humanity retreated to underground fortresses and floating cities in the sky. The technology of the old era is almost cut off. The survivors rely on genetic medicines, mechanical prostheses, and radiation resistance abilities as the basis for survival. The competition for resources and the game of human nature have become the main theme. The survivors at the bottom of the underground fortress "Rock City" fight against the "Sky Council" that controls resources and power. They also resist the tide of corpse beasts and unknown threats in the radiation zone, and reveal the shocking truth about the "rotten mist" and mutated creatures.
