Sekai Saikyou no Maou desu ga Dare mo Toubatsu Shi ni Kite Kurenai node, Yuusha Ikusei Kikan ni Sennyuu Suru Koto ni Shimashita.

Lucifer, the strongest Demon king has ruled the demon race with his overwhelming power.

Making a Harem with his dearest wife, he spent several hundred years eating, making love and sleeping.

Tired of sleeping, the Demon King began to seek for a powerful enemy.

Why doesn’t the hero come to subdue him? Even though he’s been waiting for so long.

Lucifer then turned himself into a human, and decided to go and see the military academy, which is a training institution for the heroes.

The best way to know what’s inside is to enroll in the school.

He quickly passed the entrance exam and enrolled safely…!?

This is a story of the most powerful demon king that becomes the strongest hero by mistake.