Red rain falls, everything grows wildly, and Blue Star becomes a wasteland. Shi Lei, the former owner of a scrap recycling station, awakened to the [Modular Assembly System] at a gas station and could assemble scrapped car parts into war machines at will. Faced with the conspiracy of the mutated beast king with human intelligence to enslave mankind, Shi Lei adhered to the pragmatic creed of "use money if you can solve the problem, and build a Gundam if you can't solve it" and built a steel fortress at a gas station. With his left hand, he made a fortune every day by reselling scrap metal, and with his right hand, he assembled mechas to sweep across the wasteland. While others were still fighting for half a piece of bread, Shi Lei was already sitting on a throne powered by a Rolls-Royce engine, overlooking this mechanical wasteland that belonged to him.