Yea the way the code works more specifically is like this:
When you reach the end of a route, it calls a function. That function will create an empty txt file in your Her Fall save directory.
Called RouteACompleted.txt for example. And if all 3 routes are completed it would then create a 4th file called AllRouteCompleted.txt
Then in MH When the game is loaded. It would go and check your Her Fall saves folder, and look for those files, then it would add the characters to the game.
The main reason why I did that for the record, is because if Her Fall gets enough support and enough requests to make more after Chapter 10. I will end up making more of it, but I will be making it as a new game. So I needed to learn how to transfer data between renpy games. It will also help when MH gets too large as I plan on splitting that into multiple game releases, a Season 1, 2, 3 kinda thing if that makes sense. Mainly because the files for that game with only 1 city are already up to 16GB before I compress it down. And I have 4 more cities planned to come. So I don't see a way to get all of it into 1 release.
My next thing I want to learn is how to make video pack things. So for example with Her Fall, if I ever do make a second one, I can have the gallery show content from the first game, IF you download the video pack thing.
And with MH I will be able to just do 4 Video Packs after each cities content is done, and keep each city as a separate game.