Reserved for elite students who each excel in their unique talent, the Royal Class is a special class in the Temple, an educational institution responsible for training the empire's best of the best. After the ultimate victory of humans in a long war against the demon race, a new generation of warriors prospers with the simple-minded but passionate Ludwig at its helm. However, this is merely the setting of a fantasy web novel that was never properly completed.

The 30-year-old author of this rather dull novel is reincarnated into its doomed world. He is now the 17-year-old son of the Demon King, weak and bound to die soon. Knowing his destiny, he immediately takes actions that change the plot and, with the help of some demonic allies, creates a new identity for himself. As a blond human boy named Reinhart with an unusual special power, he enrolls in the Royal Class—where all the protagonists and villains are—to study, train, and finally reach the story's ending.