Kuusen Madoushi Kouhosei no Kyoukan

Humanity lives in floating aerial cities after magical armored insects drive people from the land, and aerial combat mages fight the threat with their powers. On the wizard academy city of Misutogan, Kanata Age is assigned to instruct a struggling team of three girls. Once celebrated as the “Black Master Swordsman” and an elite ace of the S128 special team, Kanata is now despised as its “traitor.” His new students—Misora Whitale, Lecty Eisenach, and Rico Flamel—make up E601, a team with ten consecutive defeats and a peculiar quirk or two among its members.