1000 years ago, after the Great Imperial War, the commanders of both sides, the demon lord and the hero, sacrified themselves to establish an empire controlled by a family with ties with both sides. The two rival families became the two Archduke that had to oversee that everything was going well. After a thousand years, both of them Reincarnated. However, while the demon lord was now the heir of his old family, the Hero was different. He Reincarnated into a Collateral line of his family, in a vassal county, and... As a woman. The Hero had now Reincarnated into a woman, and not even in the main line of his family. For this reason, everyone thought that the Reincarnation of the Hero was her cousin and heir of the Archduchy. And since he was an arrogant Attention-seeker, he made everyone believe he was the real hero.

Elmiryam was currently enrolled into the Imperial Academy, at her last year of high-school, before continuing the university at the same school. However, today a new student was transferring here from the Northern Military Academy: the heir of the other archducal family, and her old enemy, the demon lord, Reincarnated.