Once ruled by a powerful demon, the populace was saved by a hero. To prevent such calamities in the future, Rosewood Academy was established to train young heroes. Now, only the best are accepted, and Arnest Flaming is the standout scholar, known as the "Empress of Flame." One day, while wandering the halls, Arnest meets a carefree boy named Blade who possesses powers equal to her own. Blade is transferring to Rosewood Academy, and Arnest has been tasked by the King with helping him assimilate.