The Misfit of Demon King Academy: History's Strongest Demon King Reincarnates and Goes to School with His Descendants

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 those who underestimate him, along with his single ally Misha, this demon lord unqualified as a demon lord will race up the demonfolk hierarchy!

NOTE: Cancelled due to manga artist Kayaharukahas passing away.