[Nagoyankee]

I actually feel that you have more than a good chance of finding your relatives. That you know their (former) profession is great because not many people are in that field. The fact that Koriyama is a small town is a plus as well.

If you're willing to go to Koriyama, it may only take a few days to find someone. If you find just one relative, you will find the others in no time.

If you have to stay where you are to look for them, you could hire a private eye here. I know it won't be cheap, though. It could cost you less if you just hopped over here and do it yourself.