Chivalry of a Failed Knight - S01

In this world, a few humans can shape their souls into powerful weapons. Known as "Blazers," they study and train at the prestigious Hagun Academy to become Mage-Knights. Among the students is the so-called failure Ikki Kurogane, the only F-rated Blazer. But when the worst student at the academy accidentally sees Stella Vermillion, an A-ranked Blazer who is also a princess, naked, she challenges him to a duel with harsh terms: the loser becomes the winner's slave. There is no way Stella can lose, right? As he tries to prove his strength to a world that thinks he is the weakest, Ikki makes new friends and gains wisdom and experience.