Rakudai Kishi no Cavalry is based on a light novel by the same name, it’s written by Riku Misora and illustrated by Won. The story fallows Ikki Kurogane, dubbed the failed knight or the worst one. It is a fantasy action series, you can read the synopsis and watch the trailer after the break.
The “school sword action” story revolves around Magic Knights, 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.”
Photo Credit: Rakudai Kishi no Cavalry, SILVER LINK., Inc., Nexus