For Ezri, you will be able to ask her to be your girlfriend at the end of her next scene, which I'm working on right now!
As for Ashley, girlfriend will only be an option for her ending, as she's even more casual focused than the other characters.
There will be a possible ending involving all the main girls!
As for the final day, my plans aren't completely finalised yet, but it will be a little different to the other parties. You'll be able to pick one person to have some significant "quality time" with, which will then unlock their ending. Or, with high enough stats, you can do that with everyone at once.
Thanks for playing! <3