Sky Wizards Academy (2015)

This is based on a Japanese light novel series by Yu Moroboshi and illustrated by Yuka Nakajima. Humanity was driven off the land by the threat of magical armoured insects and now live in aerial floating cities. It's defences lie in wizards who fight the insects with magic in mid-air. Kanata Age is a young man who lives on the floating wizard academy city of Misutogan. He was once celebrated as the Black Master Swordsman, the elite ace of the S128 special team. However, he is now despised as a traitor. One day, he's assigned as the instructor of E601, a team that has suffered over 100 consecutive defeats. Miso ra Whitale, Lecty Eisenach and Rico Flamel are its members...