The open world aspect is a good thing in some regards but a weakness in others. You pretty much have to have a guide to know who to talk to if you don't want to miss things, or else just make a point of regularly talking to every NPC in the world just in case they have something new (a task made even more tedious by the fact that in this game, some things are different based on time of day). It's difficult to do well, I don't think I've seen anyone pull it off perfectly.
The story itself is alright, but feels a bit short once you account for the fact that most of the game is spent on things entirely unrelated to the main plot. It would also have been nice if the sex scenes tied into it somehow, ie, if you brought your partner(s) with you on expeditions to temples or supported your quest in some way (or, alternatively, indirectly undermined your quest, which is what I expected from, say, the Queen of Hearts or the Zanti), but that would get very difficult with the number of potential partners the game has. Many scenes are great individually, but the characters don't get developed - some characters seem to exist basically solely for their sex scenes. It would have been nice to see the characters interact with each other more (ie, you'd think people would notice Sonya bimbofying you, and that some people would have something to say about it - an amusing example I just thought of is a hypothetical arms race between Sonya and Professor Selina as the latter continually tries to re-brain you because she wants you to do well in her class).
That reminds me, some lore thoughts I had on the Queen of Hearts, now that I've finished their content after the main quest... how does their business model work? We're explicitly NOT granting men release there, so why are they spending all their money there and not just going to the brothel, which is much cheaper? We were able to convince that one green-haired woman to join us, but given how well Sonya pays her workers (significantly more than "normal" jobs like the bakery, at least), we can't do that with EVERYONE's wives. And what do we do when we get too old for most people to find attractive (I'm assuming that eternal youth magic either doesn't exist or is economically inviable, since old people exist in this world)? Sonya presumably makes enough money to retire comfortably, but what about her bunnies? Does she care enough about them to make sure they're alright after they're no longer fit to hop for her? I never could get a good read on Sonya, if she's like Hanatora and just wants to use Erica or if she genuinely thinks that her bunnies are happier being dumb (which is probably true, based on Erica's reaction to her). (Some dialogue implies the former, but if she's really only in it for the money, there's surely a better way to exploit a famous countess than just having her work as a waitress/stripper, right?)
Ah, yeah, so the consumables were the unique items. I thought they meant unique GEAR or magical artifacts or somesuch. I definitely wouldn't have had just some extra consumables be a point in favor of the Merchant Guild had I known, though Kira's panties might have still been enough of a winning argument anyways.