I Built Mechas in the Republic of China and Scared the Powers Crazy.

Traveling through parallel time and space during the Republic of China, he started as a small county magistrate in a remote mountain town. I thought I would have to survive in the cracks of various warlords, but I didn't expect to bind the [Machine Combat System] and draw the all-powerful AI butler "BT-7274" at the beginning. Want to farm explosive troops? No problem! But Setsuna looked at the system panel and fell into deep contemplation—— [Warning: To produce "tracked tanks/traditional artillery", the manufacturing cost is +300%, and the failure rate is +90%! [Tip: To produce a "bipedal/flying mecha", the production cost is -40%, the reliability is +30%, and the production capacity has soared! Setsuna spread his hands and said, "I'm not being arrogant. It's really too expensive to build a tank. I have no choice but to mass-produce mechas!" As a result, the war painting style of this world completely collapsed... When powerful forces from all walks of life came to encircle and suppress them with foreign guns and cannons, the city gates were opened wide, and five "Diesel Storm Mechas" spitting out billowing black smoke and mounted Maxim heavy machine guns trampled the opponent's position. When overseas powers invaded in large numbers with their proud armored vehicles, what they encountered were advanced mechas. While the whole world is struggling to develop propeller aircraft, the protagonist has parked the supersonic flying mecha on the roof of the Empire State Building. Many years later, when several superpowers wanted to carve up world hegemony, they looked in despair at the huge "Gundam" rising in the Pacific Ocean... "Where's the little backward warlord we agreed on? Do you call this industrial waste?!"