You Asked Me to Open a Repair Shop, So Why Did I Turn Into an Ultraman?

Ten years ago, a spatial wormhole appeared deep in the Pacific Ocean. The first monster emerged at Eagleland's Golden Arch Bridge and destroyed it. After three days and three nights of fighting, the monster was finally killed, but its blood contaminated the land and sea. The Mecha Project was launched, and countries around the world began building mechs to fight off the invading monsters. Meanwhile, the monsters attacked alongside smaller creatures, so the Mobile Special Forces were formed. When Jianghai City came under attack, Zhang Xiu was repairing machinery at his shop when a ten-meter-tall Level Three monster tore the roof off his home. Just as he thought he was done for, the System that had been silent for eighteen years chimed in: “Your eighteen-year reserved reward is ready. Congratulations, Host, you have received the Light of Noah (Growth Edition).” As the Level Three monster tried to devour him, red markings appeared across Zhang Xiu's body… Countless years later, at the moment the sun went out, Zhang Xiu stared silently at the Plasma Spark in his hand.