If you're looking for manga similar to Sky Wizards Academy, you might like these titles.
When humanity was threatened 5 years ago, the boy who saved the world was driven to despair and became regarded as the enemy of all of mankind. And now a new crisis approaches humanity. The curtain rises on a gallant drama about a hero falsely charged.
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The plots of both of these series are nearly identical, revolving around a very powerful guy who was branded a traitor at some point after having saved everyone from a powerful foe. He is then brought in to teach and protect a squadron of magic students who have been underperforming.
The near future. A terrible battle against a parasitic virus called "Gastrea" has been fought...and lost. Humanity is cornered and lives in despair. Rentaro and Enju face constant danger in their work as a team of specialists working for the Tendo Civil Security Agency, one of several groups dedicated to fighting Gastrea. Enju is one of the "cursed children," who survived the virus and gained superhuman powers as a result. A crazed top-hat-wearing terrorist is on the loose, but Rentaro's got his hands full just dealing with his fellow civsec agents!
Hundreds of years ago, humanity was beset by otherworldly creatures only known as Beasts and utterly wiped out. The last human, Willem, wakes up in a world where everyone he has ever known or cared about has been dead for centuries. With nothing to live for, he's done nothing but drift from place to place. But in his lonely wanderings, he's discovered the identity of the greatest weapons ever made for the unending war against the beasts-fairies, destined to fight with everything they have, then die.
Five years have passed since the tragic incident ended the peaceful life on Regul Aire once and for all. The Beast have reached the floating island and are threatening the last survivors. Tiat, Collon, Pannibal, and Lakhesh have become fairy soldiers and are continuing the role of their predecessors, fighting for the safety of Regul Aire. And just like all the other fairy soldiers of the warehouse, they need a guardian of the military, and so on one fateful day, Tiat encounters Feodor Jessman, a young imp and fourth-grade military officer. At the first glance he appears like a typical honor student, however, it's not for long until he reveals his true colors.
Most of the world has been destroyed by malevolent beings known as Vertexes. A pocket of humanity has managed to survive on Japan's Shikoku island, protected by the guardian deity Shinju-sama and a group of specially-chosen magical girls known as "Heroes". Sixth-graders Sumi Washio, Sonoko Nogi, and Gin Minowa are three Heroes trying to defend what's left of the world while living normal lives with their friends and families. But are three young girls enough to defeat the powerful Vertexes? And what happens when the price of their success is almost as terrible as the price of their failure?
One thousand years ago when humanity was at its peak, the world was destroyed by in an event known as the ‘Seven Days of Fire’. In the centuries that followed, nature took over leaving humans living in fear of a toxic jungle and the giant insects that protect it. Amongst this threat of disease lives Nausicaä, the young princess of a province known as the Valley of the Wind, who possesses a kind heart and an inexplicable ability to commune with the natural world. While all the young girl wishes is for the world to live in peace, her normally quiet land finds itself dragged into war alongside the battle-hungry Torumekian soldiers. Now, Nausicaä must fight for peace and attempt to find a way to save both humans and insects without losing herself to hatred.
The World Has Already Ended. The future--where a terrible battle against a parasitic virus called "Gastrea" has been fought...and lost. Humanity is cornered and lives in despair. Rentaro and Enju face constant danger in their work as a team of anti-Gastrea specialists known as "civil security officers." As if the daily fight against oblivion weren't enough, they'll soon face a threat that could destroy all of Tokyo...
In a world where crests grant powers that decide one’s fate, Prince Heale is born with Cave King—a crest just as obscure and useless as he is. Deemed a disgrace to his family, he’s exiled to a barren, deserted island without a single living thing in sight. Alone and miserable but determined to survive, he reaches for a pickax to expand the cave he takes shelter in—and uncovers the true power of his crest! It turns out Cave King makes mining and building within caves as easy as breathing. Useless no more! Instead of a life in limbo waiting for rescue, what Heale finds on this island are otherworldly discoveries and life-changing encounters!