Li Xuanyi, a young man from modern China, crossed over to become a small border lord Kurokawa Genichi in the Kingdom of Iron. His parents died young, and the population of the territory was only a few hundred. The only valuable thing was an iron mine, but the surrounding nobles were eyeing this piece of fat. On the day of the coming-of-age ceremony, the vehicle technology tree system of "War Thunder" awakens: Ninjutsu copies can be exchanged for research and development points, metal materials can be exchanged for military supplies, and vehicles must be developed step by step according to the real technology tree and maintained by real people. Starting with the Soviet T-26, Kurokawa Genichi used ledgers, iron mines, workshops and hundreds of samurai to transform border towns on the verge of annexation into steel strongholds. Ninjas have chakra, nobles have private armies, and the five major countries have the old order, and he has tracks, turrets, production lines, and an ambition to end troubled times. The Kingdom of Iron started, unified the Ninja world, and ended the human civil war; when the torrent of steel rolled over the mountains and rivers, his eyes would eventually cross the Ninja world and look towards Otsutsuki deep in the starry sky. The collision of steel and chakra will officially begin to roar in a snowy border town.
