If you have just begun to think of translating your website and going after the Japanese market, but don't have a Japanese speaking staff member or friend who can type Japanese and peruse the Internet for you, this market research is for you.
There could be a dominant local competitor that you need to be aware of. There might be social, cultural or regulatory differences that could affect your products or services.
Also, by researching the Internet, you can learn the right words and phrases to use before you translate your website.