Boomatica, this may have already been suggested (I might have missed it when searching this thread), but might I make a suggestion? I find all of the uncle's journal / diary entries interesting, but they are all done in a row. Rather than a big information dump, I suggest either having the uncle's diary reading be optional,
or revealing much of this information in pieces over the course of the game, so that the potential mystery / plot is a gradual progression.
You already sort of do this anyway with Jo'ann thinking she noticed something outside. Taking it further, maybe the MC is at the lake with Hollie and they both hear a strange noise that makes them nervous, so then the MC looks in his uncle's journal / diary to see what information he might find about it. Or maybe there is some mention by Hollie that there were difficulties at first in trying to get the private community established. The MC then reads more about it in his uncle's entries.
The additional diary entries by Jo'ann, Hollie, and Belle are all full of good information, too. I'm just not sure whether that couldn't be conveyed in dialogue instead. At higher relationship levels, for instance, the girls would open up more. Maybe when they are comfortable enough with the MC, they could be topics of conversation, rather than just diary entries. IDK. I like the diary entries, but it seems awfully text-heavy in those places, especially with the reading through conversations with the different girls as well.
The reason why the Uncle's diary pages are not optional is because they are basically the start of the story.
And it's the start of one of the story-lines that is planned.
I'm not going to lie, yes... it's a lot to read through at once.
However, it does tell you everything you need to know and a little bit about some of the characters.
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The second part serves more as a extension to the first part.
But those thing will become more clear in the future ; )
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As for the third part
Their diaries have nothing to do with the MC, nothing at all.
The diaries are about their lives, about their thoughts, fears, feelings and everything.
It's to give the people a perspective on how they think, what they went through, what makes them tick.
That doesn't mean that those certain topics won't come back later through dialogue as well.
Let's take Hollie as a quick example.
She writes in her diary about the things that happened to her, how she came to this place.
Things that she wouldn't tell anybody else, unless she trust them.
The story is out there for the players to read from the start, that way... like I said above... you see right away what makes her tick.
The end-goal is not to read that part of the story, the goal of the game is to build up a bond with her, to befriend her and ultimately to grow close to each other so she feels comfortable and safe to tell her story to you.
And keep it mind. The girls/women obviously don't know anything about him reading their diaries.
It wouldn't make sense if they just start talking about their heavy shit in life on the first meeting/dates, doesn't work like that.
But like many people in real life, they do have diaries... especially those with a hard life because it's a place to put those thoughts.