Meh ending aside, them investigating the humans and becoming ambassador is a little weird.
Didn't the story start with the demons killing an entire castle of humans, kinda glossed over the whole war thing.
Nice Chapter showing the difference in power between them, along with the cameos from his previous works.
Also On the last page, the one in the wall who's butthole and vagina is showing, who is that? I thought it was Elma but there is no tail.