An asteroid flies off its orbit and heads toward Earth. Upon learning of this, the federation announces the disaster and builds shelters. The rich and various corporations build their private shelters, while the poor have no choice but to seek refuge at government shelters.Lorne is one of the poor, but fate has a different plan for him. A system appears in his head. It helps him survive and build the strongest technological city. [Iron Gate], [Alloy Gate], [Desert Eagle], [M4A1]...[Mechanic Crossbow], [Mechanic Cannon], [Laser Cannon], [High-frequency Laser Cannon]…[Hazmat Suit], [Exoskeleton], [Fixed Mecha], [Mobile Mecha]…[Wooden City], [Steel City],...As long as he has the necessary points, there is nothing the system cannot provide.