Homesteading in Japan, is the subject of one article from escape artist. Now they changed the site a little, its now an almost made for adsense website. Besides some many facts that they got wrong, some parts of the article are not bad. So for a return to japan, not only a farm, but homesteading might be the way to go. Rural Japan has many good points. Yes I am aware of the bad ones too.
Visit the original site here:
http://www.escapeartist.com/efam15/Homesteading_In_Japan.html
***Update***
It looks like that the real original article should be this one: http://www.mail-archive.com/futurework@scribe.uwaterloo.ca/msg07324.html again this is from a scrapper site. I think the original came from a university mailing list.