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Thousands of years ago, human warriors drove all alien races to the other side of the sea, and called the driven beings "demon tribe". Since then, the demons and humans have been fighting for thousands of years. For thousands of years, the various clans in the Demon Clan were divided. The seven most powerful beings dominated one side and ruled the entire Demon Clan continent with the title of "Seven Grand Dukes". Thousands of years later, Irene, a little half-demon girl who was spurned by the demons, accidentally met Leya, an unidentified amnesiac human. "I will definitely become the only king of the demon clan in the future! You can be my retainer!" Irene said this, stretched out her hand towards Leya, and accepted Leya as a human being as a demon. From then on, an epic story targeting the Demon King began.