Plot Summary: 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."
http://www.animenewsnetwork.com/ency...e.php?id=17062


Rakudai Kishi no Cavalry: Chivalry of a Failed Knight episode 1 by Horriblesubs:
http://nyaa.se/?page=download&tid=740402