Have all the materials, playing on pc. I talk to Mayu, then error message. I hit rollback, try again, and so on and so on. Sometimes it plays the szene where Ryoko's room is been build, but never Charlotte's. Mayu's workspace was redone, right? Maybe while doing that, that bug came along.
That is a not so common bug, what pc do you use and it's version, plus where did you download the game? Because that happened to me when I downloaded it in another site other than itch or patreon for every scene in the game if I ever clicked save or load. My windows wasn't the problem I am using Windows 10.