Hyrum, the most powerful Demon King in history, ruled with overwhelming might over the continent of the Demon Tribes, where power is everything. Hyrum defied the divine decree of the Demon God, who controls all demons, and lost his life after a fierce battle. Even the strongest demons under the Demon God’s control cannot defeat the Demon God. Realizing this, Hyrum was reborn into the world 500 years later as the weakest race, human, without the blessing of God. However, the human race develops too slowly, and its limits and ability increase values are higher than those of any other race. Hyrum, who inherited the level of his previous life and became a member of the human race, gained extraordinary power even though he was a human who were regarded as inferior. With his overwhelming power, he defeated an ancient dragon and made it his friend, sent a Hero to the Gates of War, and crushed a conspiracy surrounding the royal palace with sheer force. The former most powerful Demon King is reborn as an inferior human and becomes even more powerful!