How can I link Fire Emblem Heroes to a Nintendo Account?

You can link an account by tapping Menu then Account Management on the title screen or Misc., then Account Management, then Create/Link a Nintendo Account.
Note: If you do not have a Nintendo Account, please see 【What is a Nintendo Account】

■ Steps

1. Open the Account Management menu from the Menu on the title screen or by tapping Account Management in the Misc. menu on the home screen.
2.  Tap Create/Link a Nintendo Account.
3. Input your email address and password to log in. If you have already signed in to your Nintendo Account, tap "Select this account".

Note: Double check the Nintendo Account being displayed carefully before performing this step.
For instructions on how to transfer your save data, see 【How do I transfer my save data? (When changing to a new device, etc.)】