Due to Japanese censorship laws, we can't ship our uncensored titles to the country. This is also why all of our physical releases have a "Not for sale in Japan" disclaimer on them. I'm not familiar with the rules and regulations of the other countries you mention in your post, but I know that many Asian countries have strict laws regulating pornography in one way or another. As a rule of thumb, if we don't ship to a specific country, it's because possession of our books would violate local law, and I would strongly advise against trying to circumvent that by using proxies or any other means.
My best advise is to look into your local laws and make absolutely sure that you use legal means when importing books from us.