You can satisfy your curiosity trivially by looking for cross-currency Bitcoin volume stats and looking for the JPY volume. This will avoid me having made directly critical remarks of a Tokyo startup; that is, for a few reasons, something I am careful about doing.
Some combination of "I am an optimistic guy and like seeing the good in everyone", "This is, like Silicon Valley, a very small town where everyone knows everyone and where making friends is higher expected value than making enemies", "There exist people / organizations I care about which gain or lose karma in proportion to myself and I feel responsibility to not damage their interests", and "I can be trivially deported."
Also not on topic, but just an hour ago on prime time Japanese TV there was a Bitcoin ad. It appears some Tokyo based btc exchange is generous enough to run ads for the good will of informing regular people of how btc is the future of money.
