The story is set in a world where humans with supernatural powers known as Blazers can materialize a Device, weapons made through a person’s soul. Ikki Kurogane, dubbed the Failure Knight by everyone around him, encounters a half-naked girl, Stella Vermillion, as she changes in his room. This encounter changes Ikki’s life as he strives to become a real Mage Knight by reaching the peak of the Seven Star Sword Art Festival, an annual event held by the seven Mage Knight Academies in Japan to determine the strongest Apprentice Knight between the schools. The winner of the festival becomes known as the Seven Stars Sword Kings. The Seven Star Sword Art Festival features actual combat and the possibility of competitors dying exists.