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The manga of the popular Light Novel series of the same name: Sisti attends a magical academy to hone her skills in the magical arts, and hopes to solve the mystery of the enigmatic Sky Castle. After the retirement of her favorite teacher, the replacement, Glen, turns out to be a tardy, lazy, seemingly incompetent bastard of an instructor. How was it that Glen was hand-picked by the best magician in the academy!?
Sid Brice, the most powerful knight of the Age of Legends and also known as "the barbarian". After being resurrected by the young "prince" of Calvania, he is assigned as an instructor at the school of magical knights. From four classrooms that inherited the ideology of the founder's knight, he was assigned to a class of failures that strangely bears his own name.... "You have no shame as knights, do you? Drop your swords." The strongest knight is a barbarian. The new "instructor" series begins!