I have a couple of suggestions:
- In the past, I had a simple savings account with Shinsei bank. When overseas I could withdraw the money from most ATMs using a simple debit card. This method was easy (probably the easiest way you will get), but you would need to determine how cost effective it is. From memory I believe it was ok.
- Another option would be to transfer money via paypal. I'm not sure if this will work as Japan's PayPal has a lot of restrictions not imposed on accounts of other countries. In theory, you could create a PayPal account in Japan and an account in Germany. Then transfer money from one account to the other ( you should be able to do all of this online). If you wanted to reverse the flow of money from Germany to Japan then it wouldn't work. Personal PayPal accounts in Japan are not able to receive donations or something to that effect.
- My next suggestion was going to be to use Lloyds bank, but apparently their remittance service has been taken over by Shinsei bank http://www.japantoday.com/category/business/view/shinsei-bank-to-begin-overseas-remittance-servicehas been taken over by Shinsei bank I. I have no experience using the Shinsei remittance service, but you can find more information about it at http://www.goremit.jp/here.