Thank you for troubleshooting the game.
I'm sorry about your savefile! Hmm... at this point I can only think that the savefile somehow got corrupted and the game gets stuck waiting to read a value it never finds. I'll check the save file loading code and see if I can add some safeguard against unexpected corrupted data.
Edit: One more question: When the game got stuck on the black screen, was it before or after it shows chibiRyS downloading screen?
Thank you so much!