UPDATE 2022.01.14
How to remove your Apple ID (iPhone)
1: Remove your Apple ID from the app
Instructions
1-1. On your iPhone device, in the settings window, select the account.
1-2. Tap [Sign-in & Security].
1-3. Tap [Sign in with Apple ID].
1-4. Tap [NOBORI Service].
1-5. Tap [Stop using Apple ID].