On the brink of death, the strongest warrior of humanity, Ang, mysteriously reincarnates sixty years into the future with the strength of the "Strongest Demon" — a dangerous double-edged sword. In order to resolve his regrets and unveil the truth, Ang has no choice but to continuously "evolve" in a bid to escape his past fate. "I won't let myself be a bottled-up demon! If I want to get out, I must rely on myself!"