Unfortunately, this translation is too direct. There is no culture in the text and it feels weird.
Do you have a Japanese person manning your telephones? You list a 1-866 number on the site, but be prepared to answer the phones in Japanese.
Japanese people are very tolerant of the outside world and English -- you would be better off working on PR in Japan and keeping your site in English than translating into mediocre Japanese.
If you make the jump to support the Japanese, they expect that you support them in every means possible or else they will not even attempt to contact you. If you show yourselves in English, they will be more kind and understanding.
If I were you I would immediately take this site down and work on PR in Japan. Come over here and meet with folks.
Japanese people love foreign technology and would be happy to accommodate you. Be careful to not offend Japanese people by using their language and culture incorrectly.