A young girl’s fist saves the world twice.

​In a certain world, the great power En launched a massive invasion to unify the land under its rule, engulfing countless nations in flames. However, a shocking event occurred when Black Dragon, a captain leading a unit of just one hundred soldiers from the small nation of Taihei, wiped out an invading En army of thirty thousand. With that impossible victory, Black Dragon’s name echoed across the entire continent.

​The legendary hero who brought peace to the world was supposed to have ended their life for a certain reason. Instead, they wake up reincarnated in an alternate world with a completely opposite appearance. The otherworldly fantasy of iron fists versus magic science begins now.