Kendo Imperial Realm: Rise of the Human Race

[Swordsmanship + war + single female protagonist + no harem + little abuse in the early stage, invincible in the later stage] The young man came from the wilderness and determined to become a swordsman since he was a child. He possesses unparalleled talent. When he walks out of the wilderness, what kind of legend will he create? I, Long Yu, have a sword that can kill desolate beasts, slay monsters, eliminate traitors, and fight my way out of this hopeless land! Attacking cities and seizing territory, and fighting for war. This will be a blood-stained epic of the rise of the human race and their resistance. The sword is integrity, and sword cultivation is the backbone of the human race. I, Long Yu, have a sword, which should carry forward the past and open up the future, and inspire the aspirations of the human race.