The Little Girl's Fists Save the World Twice

In a certain world, the great nation of En, driven by its ambition to unite the continent, launched a massive invasion that engulfed countless countries in the flames of war. But everything changed when Kokuryu, Captain of the Hundred from the small kingdom of Taihei, annihilated an army of thirty thousand En soldiers with just one hundred cavalry. His name soon echoed across the entire continent. After leading the world into an age of peace, Kokuryu was supposed to have met his end for a certain reason...Yet when he opened his eyes again, he found himself reincarnated in another world with the complete opposite appearance... as a little girl?! An exhilarating isekai fantasy where iron fists clash against magitech begins!