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

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…