Maou Gakuen no Hangyakusha: Jinrui Hatsu no Maou Kouho, Kenzoku Shoujo to Ouza wo Mezashite Nariagaru

Also known as: 魔王学園の反逆者～人類初の魔王候補、眷属少女と王座を目指して成り上がる～

by Gelatin Mizoguchi

To demons, humans are nothing but slaves. Morioka Yuuto, an ordinary high school boy, is selected as a candidate to be the next demon king. He is admitted into Ginsei Academy, a school for demons where he's scorned upon by the other students. "...I'll make you the demon king. So... make me your kin." After meeting Himekami Rizeru, a beautiful demon girl, Yuuto's world begins to change.