Maou Gakuen no Hangyakusha

Yuuto, a typical high schooler, stumbles upon a mysterious tarot card beside his bed one day. When he shows it to his parents, they reveal his demon lineage and the potential for him to become the next Demon Lord. To develop his devilish skills and attain the highly-coveted title, he enrolls in a demonic academy. Along the way, Yuuto attracts a group of admirers, forming his own harem.