Kindly be assured you can update your card information via the [Sakura Mobile My Page].

Sakura Mobile My Page: https://myaccount.sakuramobile.jp/auth/login

If it's your first time to log in to the [Sakura Mobile My Page], kindly refer to this article on How to log in to [Sakura Mobile My Page] for the first time?

1. After you log in to your Page, kindly click on the three dots on the upper right as shown in the below picture

2. From the menu, please select the option (Account):

3. To change and update the registered card, kindly click on the pen mark as shown below:

4. From the next page, you can choose the option (Update Card Information).

5. On this page, please enter the details of the card to be used for payment. Your currently registered card will be deleted, and the newly entered card will be used for future monthly recurring payments.
※ If you plan to use the same card as before, please re-enter the details to complete the payment.

NOTE: 

We accept VISA, Master, JCB, AMEX, Discover, or Diners. 

We do NOT accept direct bank transfers, cash cards, or prepaid debit/credit cards.

If you face any issues when updating the new Credit/Debit Card, please take a screenshot and send us an email to contact@sakuramobile.jp