Thanks for the great code!
I have put this code in Japanese for other developers. ( https://renpymemo.hateblo.jp/entry/2024/01/20/005654 ) I have put the code together with the changes I made for myself, is that OK? If there are any problems, I will remove it. Also, please let me know if there is a licence for this code.
And I report that I could not press Save the Game in the demo. However, the code I incorporated into my own game worked fine, so this may be due to my environment.