Maou Gakuin no Futekigousha: Shijou Saikyou no Maou no Shiso, Tensei shite Shison-tachi no Gakkou e Kayou
The Misfit of Demon King Academy
In the distant past, a war between humans and demons caused a lot of trouble. Demon King Anos Voldigoad gave up his life to end the war and bring peace to the world.
Two thousand years later, Anos is reborn. He learns that the level of magic in the world has decreased and that his legacy is not remembered correctly. He enrolls at the Demon King Academy, an elite school, to reclaim his rightful title.
Anos has to prove to everyone that he is the true Demon King. He sets out to find the people who are altering his past and make sure that his descendants recognize their true ruler.