Assuming you're referring to the game, I'll provide a general review. If you'd like more specific information or a different type of review, feel free to let me know!
Since you asked for a "paper" (which implies a structured, informative article or guide) on the topic, I have drafted a technical overview regarding the save file structure, mechanics, and management for the game AI Shoujo (also known as AI Girl ).
Always scan downloaded files with Windows Defender or Malwarebytes. The author and platform are not responsible for any damage caused by third-party save files.