Chisaki got an IF scene
Tsubomi got an IF scene
Following this, Kanako will most likely get an IF scene where they actually have sex on that trip, which will be interesting to see considering that Kanako out of the trio is the only one who has no grounds for holding any semblance of romantic feelings for Ueno so seeing an IF scenario where she actually gets really into having sex with him could be interesting.
I really don't get the manaka obsession, they have no chemistry whatsoever, not even attracted to each other and Tsubomi is a healthy alternative with mutual attraction. Just baffled. Might have to stop reading this
But it makes the most sense:
Chisaki couldn't be honest with how she felt for Ueno and only gets aroused by bullying him.
Ueno was already in love with Moka when Tsubomi started getting attracted towards him.
And of course Kanako was never in love with Ueno so no chance of her ever winning.
Now Ueno and Moka are wokring on improving themsleves which i'm enjoying seeing, these IF scenarios are a good compromise without making Ueno regress his character development.