After fighting in the war, Lud Langart now runs a bakery, but thanks to his scowl, he can't sell any bread. He hires a beautiful young girl as a waitress to help save his business, not knowing that she was the AI of his old weapon.
Akuto Sai arrives at Constant Magical Academy—the most prestigious magic school in the world—for his first year of high school. However, when he arrives at the Academy, his future occupation is prophesied to be… The Demon King?!