The world is threatened by "magic beetles", the earth is occupied by them, and humans can only live in floating cities in the sky. Among humans, magicians who use magic to fight against "magic beetles" are born - air combat wizards. Kanata Eiji, who studies at the floating city "Mistgang", an institution for training air combat wizards, is the elite ace of the S128 special agent team, known as the "Black Sword Saint". However, now he is regarded as a "traitor to the special agent team" and is despised and hated by everyone... One day, Kanata is appointed as the instructor of the E601 team, which has been defeated in every battle. This team accommodates three girls with unique personalities -? The heroic offensive launched by the traitors and problem students is now underway.