[Sangetsu]

There are likely to be a few positions in industry available, but probably not so many teaching jobs. An interesting irony in Japan is that most companies avoid hiring people with higher level degrees as they seem to think that such people will not fit in very well. You are much more likely to find a job with a bachelors degree than you are if you have a masters, strange as it may sound.

Personally, you would be better off finding such work in America. Not only is it easier to find such jobs there, but American companies prefer people with advanced degrees and will pay them much more than their equivalents in Japan.