This is for creating a new account. I’ve double-checked and the process is 99% the same, only a different interface in the beginning. If you have any questions, let me know in the comments!
- Go to the ‘login’ button as shown below.
5. Fill in the details and the security verification, then click ‘sign up for Yahoo! Japan ID (yellow button).
6. Review your details and agree to the terms and conditions of service.
After these steps, you should receive an email (the one you used to register with Yahoo! Japan) with a code to log in.
Once you’ve done that, your registration should be complete. The email address you used to register will also be the one receiving any emails to reset your password or any security alerts.