I'm also looking for Japanese broker! Preferably, someone who's living in Japan, atm.
Mine is a fairly premium "Kawaii" name. PM, if interested.
I agree with
@hikari, it's a bad idea to use automatic translators for this kind of stuff. Beyond the language barrier, they have entirely unique customs and traditions, especially concerning business. Also, an "authentic" Japanese domainer (for a lack of better words), would have a better idea of where to go and who to contact, about the domains. The best we can do is search keywords, send an email and, hope the person on the other end speaks english...
I tried to search for the equivalent of Craigslist or Kijiji in Japan and, via an answer on Quora, found out that the Japanese are not so fond of such sites or practices, because they create tension between people.

!! So yeah, it's tough business doing business in Japan, IMO.
During my search though, I did find out that
@David Walker is apparently a "Japanese Domainer". Not sure if you'd be interested David but, looking at all the people in need, it looks like a golden opportunity!