For anyone looking for help with the game, there is a relatively easy way to edit it. If you go to the path into the registry mentioned by darkdevil, it becomes easy to edit certain game values. This is because the meaning of the values is labeled on the side. I have no idea if this is standard for unity games, as this is my first time trying to edit one in such a manner, but it is shockingly easy. The only problem is the text is formatted in a way that makes it a bit difficult to read, but besides that its simple. Now on to the steps:
1. Open the registry and insert/navigate to the path as provided by darkdevil.
2. Find the save you want to edit. Saves are marked by sX_h followed by a bunch of random numbers. The X stands for the number of the save in game (for example, I edited s5_h which was my fifth save). Just to be clear, game saves are labeled left to right, so the 1st save of the second column of the save screen is save 5, not save 2 (like if it was read up to down).
3. Scroll and find the value you want to edit to clear the games number checks. The easiest thing to do in my opinion is to just edit military to be super high and then focus on clearing all the other checks (the game makes you aware of every value you need before a deadline besides military).
It will be labeled with the in game name of the value (i.e. military is just called military in the save). Here is an example:
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. As you can see, above the value is what the value represents (military) and the number should be the same as in game. In this picture, I already edited it to have a way higher value then is probably possible. To clarify, if you type in the value you want, it will edit the corresponding binary values on the side (which are also highlighted). You don't need to learn binary to edit it.
4. ???: There seems to be other values you can modify if you scroll down, but they are not as straight forward as the other values. For example, there is a section called "servant Military H" which I assume refers to one of the H scenes in the game. I doubt editing these would make them play as soon as you access your save file, but would probably just make it so the game thinks you have seen the scene. This may make it so you can completely unlock the gallery without any work, but I have no intention of testing it because I am already at the end of the game and just learned how to edit this to pass the military check. So to those that do care, good luck.
Hope that helps.