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.�