When you reinstall the app after you have once uninstalled or factory reset your device, the data that had been saved within the app (such as your "Gohiiki") will also be reset.
Your "Gohiiki" will have to be added once again.
*If you sign in to Google Play with the same Google Account that you used when you registered for your Tanimachi membership, your Tanimachi account will be restored automatically when you start the app.