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

Anos, the Demon King of Tyranny, has defeated humans, spirits, and gods alike. But even demon kings get tired of all the fighting sometimes! Hoping for a more peaceful life, Anos decides to reincarnate himself. When he wakes two thousand years later, though, he finds the world has become too peaceful--his descendants have grown weak and magic is in serious decline. Intending to reclaim his rightful place, he enrolls in Demon King Academy, where he finds that his magical power is off the charts. Literally. And because they can't measure his power, the faculty and other students regard Anos as a misfit. With the support of Misha, the one student he manages to befriend, the misfit (Demon King) begins his climb up the demon ranks! (Source: Square Enix Manga & Books)

Classroom of the Elite

Koudo Ikusei Senior High School is a leading school with state-of-the-art facilities. The students there have the freedom to wear any hairstyle and bring any personal effects they desire. Koudo Ikusei is like a utopia, but the truth is that only the most superior students receive favorable treatment. Kiyotaka Ayanokouji is a student of D-class, which is where the school dumps its "inferior" students in order to ridicule them. For a certain reason, Kiyotaka was careless on his entrance examination, and was put in D-class. After meeting Suzune Horikita and Kikyou Kushida, two other students in his class, Kiyotaka's situation begins to change. (Source: Anime News Network, edited)

Infinite Stratos 2

Second season of Infinite Stratos.

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

As peace returns to the demon realm, Anos Voldigoad wishes nothing more than to put his reputation as the Demon King of Tyranny to rest and go back to being a misfit at the prestigious Demon King Academy. Unfortunately, any tranquility is fleeting: sinister demons, kings, and deities plot Anos's demise from the shadows. Rumors spread about the "Child of God," a being whose power may rival that of Anos. To uncover the truth and eliminate the potential threat, Anos must journey deep into the land of spirits. However, the spirit world is shrouded in mystery, and it may only be entered after undergoing a series of difficult trials. With unrivaled power and confidence, Anos braces himself to defeat various formidable enemies with grandiose titles. But he—with the assistance of his trusted allies—will barely have to break a sweat as the true Demon King of Tyranny. (Source: MAL Rewrite)