Just finished the game and here's how i would rate the girls.
S TIER: Olivia - Basically drama free, may take a turn for the worse depending on how she handles her fathers death.
A TIER: Michelle and Alessa (without vera) - both are fantastic and sucks you cant throuple both sisters.
B TIER: Kimberly, Julia and Candice - Fine choices just a bit boring.
C Tier: Alyssa + Vera (pretty much a sub/dom relationship that i have no interest in)
F TIER: Kim and Keyla - you reap what you sow.
Keyla is actually the hottest girl in the game but boy she is such a trash ass character.
For me it would be
S-Tier :
-Michelle, just can't say no to her or make her sad
A-Tier :
-Olivia, no much drama, likeable all around and one of the best looking girls
-Julia, only downside is that it feels really rushed (thought i think the dev said he will rework some of early parts). Also i really don't want to get involved in that drama with the ex...i hope it is dealt with swift.
B-Tier:
-Kimmy, her chemistry with the MC is great and she is fun, thought, not really my type.
-Vera without Alessa, hot and fun (and yeah, i know not gonna happen)
C-Tier:
- Alessa, dunno i just don't find anything particular interesting about her, even the backstory is just kinda bland
- Candace, same as Alessa, i just don't find her interesting, feels overal more like a sidegirl
F-Tier:
-Alessa+Vera, frankly just no interest in a poly relation. Maybe it would have worked for me if they wouldn't be a couple, the throuple being formed later on and they wouldn't be bi.
-Kim, i so hope we can bang her sister and make sure she will know
-Keyla, everything about the backstory and her relation with Zecke is bringing her down hard and make her look really stupid. If she would at least fight to get the MC now, but even that she doesn't do, just sitting on her ass, waiting and doing nothing.