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Arthur, who was traded to the Demon King as a sacrifice, turned out to be a heretic hero chosen by a mysterious goddess who was not the god of the church, and faced the risk of being judged at any time. I thought that as long as I didn't expose myself, I could enjoy my noble life with peace of mind, and at the same time, I could use the knowledge from other worlds to improve my life. But he unexpectedly awakened and became the Demon King at the same time. The Demon King was arranged by the goddess to be his secretary. The housekeeper who had served the family for many years was also a demon. The first Familia created assassinated the emperor of the great empire. Even his dependent sister seemed to have her own secrets. "Goodbye, my ordinary aristocratic life." The young Duke was about to cry without tears and embarked on an unknown road.