This Brave Man Is so Magical

"Well, I want to ask, can we really summon a hero?" "Oh! Of course, this summoning ritual is exactly the same as that of the human race. Logically speaking, it can definitely summon a brave man!" "Great, the human hero defeated our Demon King. Our hero should be just as powerful, right?" "Without a doubt!" "But, we are demons! The brave man shouldn't be a human, right?" Hiss... A few years later, the new Demon King defeated the brave man and completely ruled the land. No one could stop him. But no one had time to lament the failure of the brave man. Because to everyone's surprise, the Demon King was actually a pretty good leader, at least much better than the human kings he once fought against! He is currently investing a lot of funds in scientific research and vigorously promoting the development of talents, because the devil is ambitious and wants to continue to conquer the moon!