Try using this: https://www.torproject.org/index.html.en
But you'd have to hope that your exit point is always in Japan. Worth a shot if you want.
Or if you're really desperate, buy server space in japan and tunnel your connection through that.
Human history is the story of complaisance. While disaster is fresh in our memory, we take precautions. But as the memory of disaster recedes, we start to take risks.