I Corrupted my game using a save editor in YW3 Sushi

I did it and the worst possible outcome happened when i did. I finished the game, and my save file is done for. Luckily, I could actually transfer said save to Sukiyaki and lost my old one

If you don’t have a backup, then you’ll either have to start over, try to recover it, or try a file recovery tool, but that probably won’t work if you have left if for a while (I think).