Rakudai Kishi no Cavalry is set in a world where only a select few can turn their souls into weapons and are known as Blazers. Those gifted enough to wield that power attend the prestigious Hagun Academy, where they train to become Mage-Knights and compete for status in a rigid hierarchy. At the bottom of that order is Ikki Kurogane, the academy's only F-rated Blazer and a boy widely dismissed as a failure.
His life changes when Stella Vermillion, an A-ranked Blazer and princess, catches him naked and immediately demands a duel with a harsh wager: the loser will become the slave of the winner. From that moment on, the clash between the two pushes Ikki into the spotlight and sets the tone for the rest of the story.
As the series unfolds, Rakudai Kishi no Cavalry follows Ikki as he struggles to prove his strength in a world that has already judged him. Surrounded by rivals, strict rank-based expectations, and the pressure of Hagun Academy's elite training, he keeps fighting to earn respect, build new friendships, and gather the experience needed to stand among the Mage-Knights.