For those of you, whom, like myself, have already decided to discard one the girls, a message previously appeared, warning you that your choice would ultimately limit - limit, not ''eliminate'' -the number of appearances of said character in the future.
I've seen this sort of thing play out in another game : Novel's ''Twist of my Life''.
The girl you were interacting with wasn't necessarily the one you would end up with...
The game prompted you to make a choice, as is the case now.
Therefore, it would seem that, should you choose doing so, you could have the story relinquish the preeminence of any - if all, if were possible - of the main three.
This should mean more interaction with the side characters
To what degree...it depends on the game's creator, Cheeky Gimp.