Ok, so I couldn't reproduce the issue with that save file, and to be honest I have no idea what could've caused this, and I probably won't be able to fix it on your end. With that in mind, I've recorded the VN version of the ghost hunt in the form of a video so that if you just wanna continue playing the game whilst still knowing what happens in the ghost hunt, you can watch this, then use the option in game to skip the ghost hunt. (The video ends shortly after the point the skip option will drop you at.)
https://mega.nz/file/StMTwJ5Y#sS3anaNytrkUkIckyQdzhqxf84zxsJXexMZEfVltwyM