Chivalry of a Failed Knight

Chivalry of a Failed Knight (2015) is a animation, sci-fi & fantasy, action & adventure with 1 season, rated 7.1/10.

Magic Knights are modern magic-users who fight with weapons converted from their souls. Ikki Kurogane goes to a school for these Magic Knights, but he is the "Failed Knight" or "Worst One" who is failing because he has no magical skills. However, one day, he is challenged to a duel by Stella, a foreign princess and the "Number One" student. In this duel, "the loser must be obedient for life."