A brief description of the Maou Gakuen no Hangyakusha manga:
People are nothing more than the slaves of demons.
Yuuto Morioka, an ordinary high school student who was chosen as a candidate for the next Demon King. But he was awarded
devil’s school students
However, meeting a beautiful demon girl, Himegami Rizel, changes Yuuto’s life and world.
“I will make you the next Demon King.”
This is a special power that demons do not have, and it is only available to you, Yuuto.
The person who is a candidate for the post of Demon King,
Defeat the strongest demons as far as possible to become the Demon King, climbing to the top of the demon!