I think delkira approval seal from vending machine of skill is going to be somehow connected with this arc.

I mean, delkira was visible to only iruma after harvest festival.. Next delkira seal of approval on skill sheet.. And many other plot are enough to already prove that iruma is linked indirectly somehow to demon world and soon old guy will reveal is what I think we will see in future chapters..since iruma just can't stop here and his rank shld be 10 and him being demon king is what this writer been drawing from start..

-i wanted story to be on how human conquered demon world with his own skill and power , no nepotism is kind of story what I really like. But after seeing what's happening currently, it seems nishi is currently just farming fans and streching plots too long,just like how human girl arc series was too long and in end, same thing happened what most fans already predicted..

My English is bad as its not first language,just wanted to post this as I want to come back one day to see if I predicted right.