Lucil, fabled as the strongest and most feared Great Demon King… However, he was actually the hero who tried to protect the people abandoned by God.

He entered a slumber to heal the wounds he sustained in his battle with God, and awakens a thousand years later.

What met his eyes was a peaceful and prosperous city. There was no longer any need for him to protect the people. The people had started standing on their own two feet, so from now on, he would no longer be the Demon King, but just one man, enjoying to the fullest the world people had created.

But he doesn't know.

…That for a thousand years, his subordinates had been training diligently, growing stronger and continuously expanding their influence, all for the day the Demon King would awaken. He doesn't know. That an anomaly like him could never live a normal life.