A gray fog of unknown origin swept across the world, and civilized order collapsed overnight. The world is occupied by alienated monsters, and the surviving humans are struggling to survive in the ruins. When the doomsday comes, the ordinary office worker Xia Qiyuan accidentally activates the "Doomsday Shelter System" and the apartment room he lives in becomes a personal territory that can be upgraded and transformed. From reinforcing a door, to making a water purifier, to having your own weapons workshop and plantation. Xia Qiyuan relies on this continuously upgradable shelter, caught between monsters and unpredictable people, to collect resources step by step, improve his strength, and rescue his companions. His ultimate goal is to turn this small shelter into a mobile castle that can travel freely in this wasteland, search for lost civilizations, and uncover the truth about the coming doomsday.
