The devil who bed as a boy enters the hero training institution! Lucifer is the strongest demon king in the world who dominates the demons with his overwhelming power. The angel and the female hero who had come to subdue me were made a wife, and it continued the life only of eating, eating, and sleeping in harem with them. And, the destructive impulse which sleeps in the blood of the devil starts to tingle in search of a strong enemy one day when 500 years have passed since the hero came at the end. Even though I waited so long, why doesn't the hero come to subdue himself? Then, Lucifer changes into a man boy, and it is decided to go to see the state of the military school which is a hero training organization with Lena who is a former hero and is now my wife as a guide. "Herberia Empire Mildiana's Direct Military School" produces excellent military men and heroes. Lucifer changed his name to Theodor and easily passed the entrance examination for this school. Moreover, Th