I might know what's causing this! Here's the fix that works for the Steam version—it's a bit involved:
- Navigate to %USERPROFILE%/AppData/LocalLow/Rascal Devworks/Sigh of the Abyss/NaninovelData/Saves
The easiest way to find it is to click on your Windows icon, type %appdata% and open the file folder with the same name. It will open the Roaming sub-folder; click on AppData, then LocalLow. There should be a RascalDevworks folder there!
- Backup of your saves, just in case!
- Remove the globalsave & settings files;
- Then do a fresh install of the game;
Let me know if it works!