Mercenary Black Mamba - Chapter 651 - Episode 3 Green Flow

A teen is summoned to another world as the Hero. It turns out the Hero can power up women with his cum.

With one strike of the sword, I cut through the path of life and death, and slay all those who have betrayed!......I don't want to be the sword; I want to be the swordsman.I don't want to be a pawn; I want to become the chess player.An ordinary person who insists on living his own life in this world.Unfamiliar roads lie ahead, destination unknown.As I carry on, unconsciously, it has been a journey of trials and tribulations. Behold the new world I create.

…but it seems pretty doable.

A man with a lifelong martial arts background, raised in Asia due to his family's profession, moves to the US for education and work. He discovers Historical Medieval Battles through a colleague and becomes deeply passionate about it. He trains hard and becomes skilled enough to represent his country.During a competition, his armor fails, and he's struck in the head with a two-handed axe, seemingly dying. But is this truly the end?