This is a comedy about Luca, the son of the Demon King, who sets out on a journey to the human world to train to become the Demon King. However, Luca has an angelic, kind-hearted personality, and on top of that, he is naive and innocent, often acting recklessly. Claude, the butler who accompanies him as his guardian, watches over Luca with overprotective care, but he is constantly caught off guard by Luca's unpredictable and wild behavior. The story follows the unusual adventures of the future Demon King.