Board Thread:Questions and Answers/@comment-71.34.164.195-20170510195115/@comment-27861768-20170510224656

As far as I know there is no way to "rollback" a save, but you do have 99 save slots available. Generally, it's not recomended to use just one save slot on RPG games. So sadly, unless you have a save from before you get to free roaming part, you'll have to start the entire game over.

And if you do restart, you might want to consider making a save at start of each new area...