That Nafra twist was unexpected, and I'm glad that he wasn't just another student who gave up his points to Iruma for no reason.
If anyone else forgot when cherry blossoms appeared before, like I did, they were in chapter 9, when Iruma used magic to make them grow. They don't grow in the demon world, so this probably means that the demon king has been to the human world before and enjoyed it. Maybe he even wanted a bridge between the worlds, like Iruma.
But why is "listening to one's own desires, and fighting for them without getting tiring or giving up" considered undemonlike? The villainous group would say demons should listen to their desires more. If I had to guess, maybe demons are naturally tempestuous, and will easily give up on a desire and pick a new one if it gets too hard, so the undemonlike part is not getting tired or giving up. But considering Amelie, Sabnock, and Asmodeus, who are prime examples of demons who always follow through on their desires, that doesn't sound right.