Needs to withdraw and send money urgently in Japan?

My sister is dealing with a situation that is extremely complicated in New York and I want to help her out by wiring some money to her. I am currently in Japan but holds a Mastercard from a bank with no local branch here. I have tried to send her the money online but failed many times both with Western Union and Moneygram. Is there anywhere I can withdraw the money in cash? The Japanese local banks will not do it... Please help me.