No, you cannot cancel a transfer which has already been requested and processed. See below.

• No action required
  Ex.
  • Incorrect transaction detail(s) such as branch name, account type or account holder's name.
  • Receiving account was closed.
  The receiving bank may reject the transfer and send the transfer amount back to your account.

  Check Account Details and Activities below.
  Online banking  > Accounts > Balance Summary

  Check Account Details and Activities below.
  Online banking  > Accounts > Balance Summary

• A "kumimodoshi (procedure for reversing a transfer)" request is necessary.
  Ex.
  • A deposit account which you mistakenly instructed our bank to transfer funds to exists, and the transfer has already been credited to the wrong deposit account.
  • The beneficiary instructed you to request a "kumimodoshi" from the remitting bank.
  In such cases, please request a "kumimodoshi" from our bank. Refer to Service Charge  for the fee.

• The kumimodoshi process requires the beneficiary's authorization to debit the transfer amount from the beneficiary's deposit account. The process does not guarantee that the transfer funds will be returned.
• It may take some time for the funds to be returned.
• The transfer cancellation fee will not be refunded even if the transfer funds are not returned.