Looking at the "penetration" of bitcoin by country, I'm surprised at how low Japan is on the list. I would think that the technophilic home country of MtGox would find the Bitcoin story interesting, especially given that it was created by "Satoshi Nakamoto."
And the new quantitative easing (money-printing) policy of Abe's government should give Japanese a strong incentive to look into hedges against inflation, such as Bitcoin.
Not to mention that MtGox is located in Japan. Maybee it's because many live in small apartments where a noisy mining rig would be quite disturbing.