Rakudai Kishi no Cavalry

There aren't many people in this world who have the capacity to shape-shift their souls into potent weapons. These people, known as "Blazers," attend the prestigious Hagun Academy to learn the skills necessary to become Mage-Knights. The only F-rated Blazer among the pupils is rumored failure Ikki Kurogane. The lowest student in the institution, however, is challenged to a duel with terrible consequences—the loser becomes the slave of the winner—when he discovers Stella Vermillion, an A-ranked Blazer who also happens to be a princess, naked. There is no way Stella could possibly lose, is there? Ikki's journey is followed in Rakudai Kishi no Cavalry as he attempts to disprove the world's perception that he is the weakest while making new friends, learning from his mistakes, and gaining experience.