Can't save this useless angel

"As the son of the Grand Duke of the Devil, not only do you not have the cruelty, violence, greed, and arrogance that the devil should have, but you are also contaminated with the soft-hearted, kind, considerate, and frugal habits of those stinky angels. You are so bad at a young age. How about you pay it back when you grow up?"
"And the most important thing is that it doesn't matter if you are considerate to your sister, why should you be so considerate to outsiders, why!"
As a result, the young demon was punished by his sister to be trained in the human world.
……
"As an angel, you don't have half of the kindness of an angel. On the contrary, you are extremely lazy, idle, gluttonous and sleepy. You have been contaminated by the seven deadly sins of the devil. If you continue like this, you will become a fallen angel sooner or later. !"
As a result, the childhood waste angel was also driven to the human world by his family.
All in all, this is a book about the daily life of useless angels and shameful demons in the human world.