Maou Gakuen no Hangyakusha

Yuuto is an ordinary high school boy who one day notices a mysterious tarot card by his bed He shows it to his parents who give him the good news as the son of demonkin he is eligible to become the next Demon Lord As such Yuuto is soon brought to a demonic academy in order to improve his devilish skills and earn the title of demon lord And you know get a harem along the way