The world is home to a limited number of individuals who possess the rare ability to wield their souls into powerful weapons. These gifted beings, known as "Blazers," attend the world-renowned Hagun Academy to train as Mage-Knights. Despite being the only F-rated Blazer, Ikki Kurogane is a determined Hagun student. His life takes an unexpected turn when he catches a glimpse of Princess Stella Vermillion, a highly accomplished A-ranked Blazer, in the nude. Angered by his unwanted intrusion, Stella challenges Ikki to a vicious fight with a compelling condition—the victor claims the loser as a slave forever. It seems like an impossible feat for Ikki to beat the unbeatable Stella. However, Ikki grasps the opportunity to prove his mettle and dispel his reputation as the academy's weakest member. Along the way, he finds camaraderie, insight, and valuable training experience in the ultimate quest to become a Mage-Knight.