The second season of Kikansha no Mahou wa Tokubetsu desu.

The worst calamity humankind has ever faced...
 
Shadow Realms have ravaged the earth and decimated almost everyone in their way. The survival of humanity hinges upon the success of just six mages, including analytic fighter Desir Herrman. The remaining heroes make one final stand to end the bloodshed...but to no avail. Desir closes his eyes on what should be the end of his life—only to open them and see the beginning of his school days?! Desir has returned thirteen years back to the past, where he’s been given another chance. A chance to see the loved ones he lost, a chance to meet his fellow warriors again, and a chance to save the world…!
 
(Source: Yen Press)

Another dimension that continues to taint our world, the Shadow World. Humanity is faced with the worst calamity, known as the Shadow Labyrinth. In spite of their desperate attacks, Desir Herrman and his friends lose their battle to the Destruction Dragon, Boromir Napolitan, and the world comes to an end. When Desir is convinced of his end, he opens his eyes... to find himself 13 years in the past. Desir has gone back in time to the enrollment ceremony of Hebrion Academy, the top school for mages in the Empire. 
 
To change the future of impending doom, Desir reassembles his friends once again to save the world!
 
(Source: Crunchyroll)

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