Chivalry of a Failed Knight (2015)

Magic Knights wield weapons that embody their souls, battling in a world where power is paramount. Ikki Kurogane enrolls in a prestigious academy, dubbed the "Failed Knight" due to his lack of magical abilities. Despite his shortcomings, his life takes a turn when he faces off against Stella, a formidable foreign princess and the school's top student. Their duel carries high stakes: the loser is bound to serve the winner for life. As tensions rise, Ikki must confront his limitations and prove that strength comes in many forms.