Chizuru has honestly never been one of my favorite characters, but she deserves a big round of applause here for putting her foot down and giving her sister the tough love scolding she needed. Chitose deserves more than she thinks she does.
I think it seems like she'd still ship those two together and enjoy her company platonically but it does feel like one of those things where it's like "This friend group is dating each other already they just don't realize it" like how everyone in gsnk acts dumb with each other