To be honest, I don't know of any. However, it looks like there may be a better market opportunity than Web hosting then.
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You would have very little competition with the English speaking market, there are only a few providers here. With the Japanese speaking market you are going to have to localize the service in Japanese and Yen... very few customers are going to pay in dollars or sterling. There are also business issues to consider. Email me off list if I can be of any help or give any advice.