And, I've said this before, but my idea of romantic ending is neither uniform across all five poster girls or necessarily "white picket fence."
Of course the way the LIs are written (and as far as I understood a previous post by TD (Edit: he actually just wrote it again)) we won't just see a "and they lived happily ever after" with every girl (not sure, we'll see that with any girl, to be honest). But as things stand right now, there might be paths for a committed long lasting relationship with everyone of the girls.
That makes absolute sense, since even if we discount the Club stuff, all possible Love interests for our MC have different life circumstances. Just take Hana, our not quite as gothy as she looks drummer girl and August´s heir and Rosi, our Milf mom who is at PC only because her dire situation with the loan sharks. Rosi has every incentive to leave PC as soon as possible and no matter how nice Edwin is, he is part of the people who used Rosi´s situation for their gain. Even if that is overcome, a romance between Rosi and Edwin by definition has to be different from one with Hana, who could meet our MC under quite differing circumstances and has other baggage than Rosi has.
Likewise for the other girls, be it our nice epicurean artist golddigger Felicia, our lez-leaning bisexual championship athlete Veronika, our best friends ex and closet nympho model Mina. Not to speak of our sadist scheming boss Kath or our dangerous genius nerd Sophia.
The HEA of each of the LI´s by definition has to look different, since their life circumstances are different. Meeting each other is just due to the Club as a connection.