The story follows Tatsuya Shiba, a bodyguard to his sister Miyuki Shiba who is also a candidate to succeed the leadership of the Yotsuba clan, one of the Ten Master Clans that govern Japan's magicians. They enroll into First High School which segregates its students based on their magical abilities. Miyuki is enrolled as a first course student and is viewed as one of the best students, while Tatsuya is in the second course and considered to be magically inept. However, Tatsuya's technical knowledge, combat abilities, and unique magic techniques cause people to view him as an irregular to the school's standardized rankings.
