Why were we teasing a genuine romance with Nakano if we are just going to do a harem ending?
I'm pretty dissapointed honestly
I think the author wanted/had to end it quickly, thought the romance wasn't developed enough and that there wasn't enough chapters left to do something conclusive.
So they went for a quick harem end. The ending arc dilemma was only 3 chapters it might have been something else if there was more.