WALL OF TEXT AHEAD.
I usually don't do a really detailed review, but I think this one is worth it.
TLDR: Great girls, but it lacks a good storytelling.
I'll be really honest. The girls carry this game. They're all very pretty and likeable, nothing to complain in this regard, to the point I was much more invested in deepening their relationships with mc as opposed to the overall plot. I also liked the "3, 2, 1" countdown for the scenes, not sure if I ever saw this, but it's a nice addition to know when the action will end.
The plot could become interesting in the future: Multiple factions in opposition to each other, a mystery about disappearances and whatnot is the basis of a lot of good stories. My main problem is with how it was presented. I'll never remember the name of all the factions, their alliances, members, what made the "great disaster" happen, etc. And that's mainly because they were all dumped and I had no real way to absorb all this information. What this VN lacks right now is storytelling. "Show, don't tell".
There were numerous occasions where this could be applied. Instead of telling how was the relationship between mc and the childhoodfriend or even ayase and her friends, why not have a small flashback of them when they were young? Instead of making a minor character info dump about the "great disaster", why not show how the events led to it happening? What about showing how the different factions are divided, maybe on a map? I understand that requires a lot more time and effort to do this, but that's the extra mile that actually makes something memorable. You don't need to explain everything from the beginning, start with a few things that are relevant at that point of the story and go from there.
For example, it would be perfectly fine to only explain the different factions when characters belonging to said factions interact with MC. This even allows you to postpone having to detail some aspects of the story or even making decisions about what will happen in the future, which actually serve to enrich the worldbuilding in general. Think about games like Zelda, Elden Ring, or even Elder Scrolls. You start knowing about nothing of the world and bit by bit you get to know it and by the end, usually, you still don't know everything there's to know of it. And that's actually a good thing. It makes the world you're building feel bigger than the story you're telling, leaving room for you to expand it if you want to.
But I guess that's enough about storytelling.
My next point is about the elefant in the room named Chika, as apparently she was a tough pill to swallow for a lot of people. I don't know the details of the controversy, since I just recently started this VN, but I think I might know what could have sparked this reaction. Players like to have control over how a story unfolds. The fact that she was/wasn't a prostitute is in her past, we can't change it, we don't even know for certain as of now and you suggested this might not be the case (I think I know the direction you're going). Either way, from the point the MC interacts with her, he should be able to at least try to intervene with what's happening to her. I understand you probably would like to take it slow with her, but prostitution is a really heavy topic for a lot of people to just allow it to happen, specially to someone you like. Sure, she may just have met the MC, she won't really be inclined to get his help because of that, but that should not stop someone who is trying to do what they think is right.
It would be perfectly undestandable at that scene where she is seen leaving with the old guy for the MC to go heavy with a flying kick to his face. Yes, it would be really extreme, maybe it could even damage his relationship with Chika, but it would be much better than just letting it happen. And even if this is all a misunderstanding, this could allow her to come clean about it. The feeling that something bad is happening and you can't do anything to stop it is really frustrating. Maybe adding an "extreme" option here and there could be interesting for the story.
Other than that there are minor things I'd like to point out like how you chose to present thoughts in itallic. I prefer parenthesis or something similar, as some fonts can be a little hard to notice when they're itallic (and my vision is not that good). The *something happened* way to narrate is fine, but it is only really needed when writing. Again, you could easily eliminate them by showing what happened instead of telling it. I also noticed some "continuation" problems in some scenes where the text mentioned something different than what was happening in the animation. The one I remember clearly was Ayase having her boob exposed even before MC asked her to do so. There was another with Miharu, but I don't remember exactly what was right now. Minor things, but I just wanted to point out for the sake of completion.
To conclude, I admit I had a hard time reading throught the info dumps, almost skipped a lot of them, but overall, it was a really nice VN and has a lot of potential. Eager to see how it will turn out in the future.