Apocalypse: I Got the Sharingan from the Start

Others do research, I train in martial arts. Others train in martial arts, I cultivate immortality. The story of a laid-back guy who doesn’t want to be a savior. [Decisive and ruthless] [Not brainless] I awakened a System, and the beginner’s gift is a Sharingan? What? Save the world after the apocalypse? I can’t beat the zombies. Let me lie low for ten or twenty years first. Comrades, wait for me to come back! In ten or twenty years, I’ll definitely save the world! Anyway, this is the story of someone with no desire to be a savior who gets a System.