If you don't speak Japanese and are now in the center of a large city ...... it really depends how much you can be flexible and adapt.
Say you are based in Narita - living quarters will be Japanese size - so about 1/2 to 1/3 of what an Australian would be used to. No ovens, no dishwashers... Microwave thats all oh yes and the rice steamer. Furniture - western often doesn't fit - and what the Japanese have you might have problems with. An appartment for foreigners downtown 2-3 bedrooms between 3 & 20K US$ per month depending on location and quality.
Me, I love Japan and downtow with my broken Japanese people are great - out of the city, it can be very hard work, but if you always smile and be shy and withdrawn (most difficult for me) then anything is possible.
Up to a challange, and well able to withdraw and recharge your batteries on your own in a strange atmosphere - then go for it, the experience is fantastic.
But around 50% of the people we vet & send there as expats end up hateing it before the end of the first 2 years - the others usually stay 5 and scream when they have to come home.
Life is expensive - compare it to New York or HK.
