Your username corresponds to the email address you provided at the time of registration.

If your registration was done before May 2023, your username may be a complex string of text. In such circumstances, our support team is always on hand to assist you.

You can contact us for assistance through the chat button situated at the lower right corner of your screen.

For faster assistance, email support@gigabank.jp and use "I have forgotten my username" as your subject line