Deleting the folder "Kamihime_Player-1.0-pc" and everything in it has been sufficient so far, but there are some hidden RenPy save files in "C:\Users\[Your Account Name]\AppData\Roaming\RenPy\Kamihime_Player" as well. Then download and extract xellosp's player from the first post. Afterwards, continue from step 2 that I've mentioned above.