There is only one chance. If you check the www/save folder in the game files, the saves (.rpgsave files) might still be there even though they're not shown in the game's loading screen. In that case, you could move them all out of the folder, start a new game, create new saves in all slots, and replace the newly create .rpgsave files with those you moved out of the folder before. The shown preview in the loading screen will be wrong at first, but the progress would be there when you load them.
If there are no files in the save folder, then no one will be able to help you.