Where to find save file location on android
Viewing post in Yorna: Monster Girl's Secret comments
if you want to transfer th progress, you don't need to do anything manually on Android. Just update the game on your device without deleting the old version and you will have all your saves.
If you want to manually change something in the saves, sorry, can’t help you there. It’s technically possible yet this involves root access. I decided not to write any guides on this since something may go wrong by chance and tempering with root access voids most warranty cases.