Maou Gakuin no Futekigousha: Shijou Saikyou no Maou no Shiso, Tensei shite Shison-tachi no Gakkou e Kayou

The demon lord of tyranny, Anos, destroyed humans, spirits, and even gods. But, growing tired of the neverending war, he dreams of a peaceful world and chooses to reincarnate. Unfortunately, two thousand years in the future, his descendants have become weak from the years of peace, and magic has atrophied.
Anos enrolls in a "Demon Lord Academy" dedicated to finding him - the demon lord's reincarnation - but the academy fails to recognize his strength, and labels him as unqualified.
Amidst t...