Save data can only be transferred from the PlayStation®4 to the PlayStation®5 on the same PlayStation® Network account, or from the demo to the full version on Steam or Nintendo Switch™ on the same account.
Save data will not be transferred from the PlayStation®4 to the PlayStation®5 version or from the demo to the full version if a save data already exists on the system to which you intend to transfer your progress. Please delete the existing save data on the system to which your progress will be carried over first.
The save data for the Steam version can be found in:
C:/Users/[User]/Documents/My Games/Romancing Saga 2 RotS
While it's possible to transfer your progress from the PlayStation®4 to the PlayStation®5 version, no cross-platform data transfer option exists for any platform.