You Haven't Even Started College, Yet You're Already Invincible Worldwide?

In a world invaded by countless races, would you, young man, dare to wield a long blade and fight back with all your might? Jiang Jie accidentally obtains a Slaughter System. He dares to dream and dares to act, leading humanity to the highest heights! “Even if all the people of this human realm bully me, I, Jiang Jie, will cut them down with one stroke.” This is Jiang Jie's declaration of determination!