Black rain descends, and humanity shrinks a hundred times, turning ants and venomous insects into fatal threats. Lin Chen awakens the Infinite Contract System, allowing him to subdue defeated bugs and beasts. Bidding farewell to his gold-digging ex-girlfriend, he rallies survivors, gathers supplies, enhances his abilities, and fights against rampaging mutated creatures and ambitious plunderers. He struggles to survive in the collapsing apocalypse, facing off against major bases and powerful mutated giant beasts.