[Hello Sweet Days] is an account registered in conjunction with FaceBook/Game Center/Apple ID/Google account.
In order to transfer data when reinstalling the app, please make sure to link your account before deleting the app.
▶How to operate [here]
Reinstall 
▼ How to operate
1. Remove the [Hello Sweet Days] app from your device.
2. Reinstall the [Hello Sweet Days] app from the App Store/Google play store.
3. Start the [Hello Sweet Days] app.
4. After reinstallation, you can transfer data from your previous device and play the game.
Note
・Please use the [Recommended User Environment] when reinstalling.
・If you reinstall without linking your account, you will need to issue a [Transfer Code].