Japanese people are very polite, though not overly friendly, due in part to language issues with foreigners. There is a lot of cultural difference between what is considered friendly in the Japanese culture vs western cultures.

Is Japan a safe country for foreigners?

Travel in Japan is unbelievably safe. Crime is low at the best of times and almost non-existent for a foreigner. The fact remains that Japan really is one of the safest countries in the world.

Can I just move to Japan?

The process of moving to Japan is easy as long as you are prepared. In general, expats can move most household goods into the country without a problem. It is a good idea to have an itemized list in both English and Japanese.