Well (before trans), it looks like Kachuragi has fit neatly in with the puchi Zuikaga couple, and they're all perfectly happy to be a puchi threesome. I wonder what Katsuragi makes of it.
After trans: oops, Kachuragi-chan forgot her mission to play with Zuikaga-puchis. How adorable.
Just what one would expect from puchis. So easy to become friends and went all jolly together ww It's one of the things that made these puchis sooo cute.
Aside from Ooi, none of the puchis seem to share any concept of anything like romance, at least in the exclusive relationship sense. They just sort of make friends with each other. (As seen with Fubuki's puchi being disgusted with the obsessiveness of the actual Fubuki in this series, and with the ZuiKaga puchi pair having none of the tsun in their dere.)