A year after demons attacked the academy, Seika, now a second-year, is asked by the headmistress to take part in a combat tournament after it suddenly repealed its ban on mages. Although he initially wants to decline, once introduced to the academy's other participant, a new student by the name of Mabel Crane, he decides to enter. Something seems off about Mabel, and it's strange that a new student was invited to participate instead of someone proven like Amyu. Determined to get to the bottom of things, Seika travels to the imperial capital to join the tournament. Who is Mabel, and why were the tournament's rules abruptly changed? Entering is the only way to find out.