The grey screen issue is not caused by the player’s PC, but by the game build itself. The logs show multiple “The referenced script … is missing” errors, meaning some scripts were not packaged correctly. In addition, the Naninovel engine tries to call the IsGameStarted function, which is not defined. As a result, the game gets stuck after pressing start. This cannot be fixed by the user; the developer needs to correct the missing scripts and invalid function call.