Are you living in Japan and want to start your own website using a web host in Japan? If your website is targeting viewers from Japan and the Asian region, then I recommend you use a web host in Japan.
I use HostGator and BlueHost (US based hosting services) for my web hosting needs but the main problem I had with them was latency and SEO (Search Engine Optimization).
With latency, there would be on average an additional 3-7 second delay for users living in Japan to see my websites. The reason is because web requests coming from Japan will have to reroute to the US based servers and back to Japan.