On the My SoftBank login screen, enter your information:

1. Enter your ID (S-ID) in the first box.
2. Enter your Password in the second box.
3. Click the blue button 「認証ID（S-ID）でログイン」 to continue.

On the My SoftBank home screen, look for the yellow notice at the top and click the button circled in red:
「お手続きを進める」 (Proceed with the procedure).

Scroll down to the 「支払い方法登録状況」 (Payment method registration status) section, and click the right button:
「登録する >」 (Register).

On the Terms (Manual) screen:
1. Check the circle 「同意する」 (Agree).
2. Scroll to the bottom of the page and click the 「次へ ➔」 (Next) button.

On the information verification screen, scroll to the bottom and click the blue button:
「再開する ➔」 (Resume).

In the 「支払者の選択」 section:
Make sure the first option 「契約者と同じ」 (Same as contract holder) is selected and click:
「次へ ➔」 (Next).

On the 「支払者情報の入力」 (Enter payer information) screen:
Enter your Last Name and First Name, Date of Birth (Format: Year/Month/Day), and Contact Phone Number.
Then, click the blue button 「次へ ➔」 (Next).

On the 「支払者住所の入力」 (Enter payer address) screen:
Correctly enter your address including Postal Code (Zip Code), Prefecture, City/Town, Street Name, and House Number.
Then, click the 「次へ ➔」 (Next) button.

The system will display all the personal and address information you just entered.
Check if everything is correct and click the blue 「次へ ➔」 (Next) button at the bottom.

In the 「お支払い方法を選択」 section:
Select the box below with the bank icon 「口座振替」 (Automatic bank transfer/Direct debit), and then click:
「次へ ➔」 (Next).

The screen will show a list of banks, click the button:
「ゆうちょ」 (Yucho Post Bank).

Finally, click the long blue button:
「各金融機関のネットバンキングサイトへ」
(Go to the financial institution's internet banking site) to log into Yucho bank and finish linking.

On the Yucho bank website, you need to read the terms before agreeing. Click the button:
「同意事項」 (Agreement details/Terms).

The detailed terms window will appear on the screen. Scroll to the bottom and click the button:
「閉じる」 (Close).

Now, the agree button will activate (turn blue). Click the button:
「同意する」 (Agree) on the right to continue.

Use the virtual keyboard on the screen to type the 番号 (Bango) code - Your account number.

Note: Do not include the last digit (e.g., number 1), as it is already displayed outside the text box in the system.

The screen will display all the information you just entered again.

Review it carefully once more. If everything is correct, click the blue 「進む」 (Proceed) button.

Check the first circle option:
「SMS認証」 (SMS Authentication) to receive a one-time password (OTP Code).

Then, click the 「進む」 (Proceed) button.

The system will confirm the phone number that will receive the SMS message.

Click 「進む」 (Proceed). The bank will send a text message containing the OTP code to your phone. Get this code and enter it in the next step to complete!

Check your phone messages and get the 5-digit verification code (OTP).

Use the on-screen virtual keyboard to enter these 5 numbers into the empty box, and then click the blue 「進む」 (Proceed) button.

When the screen shows a large check mark icon (V) with the text 「ご登録が完了いたしました」 (Registration completed), it means you have successfully linked your bank account!

The system will automatically redirect you back to the My SoftBank website.