For People having black screen issue follow this.
1. Go to Steam library>Hentai Girl>properties and disable Steam Cloud Synchronization.
2. Then in properties>installed files>browse>HentaiGirl_data and delete the folder named "Save".
3. Delete the "Save" folder(or the save file/files within it)
4. Open your game and enjoy
5. After completing game you can turn on Steam Cloud Synchronization to replace your broken save file just choose LOCAL SAVE FILE instead of Steam cloud save when starting game with Steam cloud synchronization on(complete the game or steam will load default steam cloud save.)

Either way it's a good game :).