Girl: "Master Demon King, can you do magic?"
Demon King: (Magic n mistakes explode)
Wei: (Wipe the dust off the devil's face n times)
Girl: "Okay, magic is too advanced. Lord Demon King, can you speak human language?"
Demon King: (shaking his head)
Wei: "He seems to be able to tell magic words."
Girl: "Okay, it doesn't matter if you can't speak, but, Demon King, can you eat by yourself?!"
Demon King: (The spoon fell on the table n times)
Wei: (Put the prepared spoon in the devil's hand)
Girl: "Forget it, I'm in despair. Demon King, you should know how to dress, right?"
Demon King: (Put your boxers on your head)
Wei: (covering someone's eyes) "Don't get in the way, you can get out!"
Sister: "Brother! The devil you picked up is so incompetent!"
Wei: "As long as I like it." (Close the door)
This is a story about an incompetent demon king evolving into a demon king, right?