Well personally when i heard it was another chapter on a side pair, i was like "oh for the love of god" then i saw it was an end of volume extra so i was like " oh ok. That's nice".I'm not really invest in the pair (or the side pair in this manga in general) but at least we had confirmation she isn't with Tsubaki just because of Nekozaki. That's said, nobody said she didn't make Tsubaki and Nekozaki roommates to have insiders.