Lyle, a boy who lost his life saving a child and was reincarnated into another world, entered the Royal Academy at the age of eight and spent his days happily with his follower, a twin dragon, and a tomboy princess. He learns about lost ancient magic and encounters a gigantic S-ranked demon... One day, while Lyle was enjoying his school life to the fullest, he was attacked by a horde of rampaging wyverns during an extracurricular exercise. To protect his friends, Lyle and the holy beast stand together, but even an immortal two-headed dragon that has evolved into an evil creature appears, putting Lyle in a terrible predicament! Lyle decides on a secret plan to save the day! (Machine Translation)