Boukun Shoujo Nero no Hangyaku

Synopsis

A Girl's Fist Saves the World Twice In a certain world, many countries were engulfed in flames by a massive invasion from the great nation of En, which aimed to unify the land. However, a great event occurred: Kuroryu, the commander of a hundred-man unit of the small nation of Taihei's army, annihilated the 30,000-strong En army with only 100 cavalrymen, and Kuroryu's name resounded throughout the continent. Kuroryu, who led the world to an era of peace, was supposed to have died for a certain reason... but she was reincarnated in another world with a completely opposite appearance...!? An otherworldly fantasy of iron fists vs. magical science begins!! Source: [Jump TOON](https://jumptoon.com/series/JT00110/)