I would look in the yellow pages or ask around to find a local magic shop. From my two year experience in Japan I found out that many magic shops in Japan have at least a few english books as well. If they do, they might be able to order "Card College" for you.
I second Richard's recommendation with MagicLand in Tokyo. If you every happen to be in Tokyo visit them. Tom-san, Mama-san and Satoshi-san are the kindest people and very well informed and connected in everything magic.
If you prefer the ebook with embedded video clips, which will help you learn the moves quickly and correctly then visit my site at http://www.lybrary.com/
and click on the "Card College 1" link. I ship to Japan for $3.50 as many CDs as you want. You can also pick up some other good card books by direct download without any delivery charges. For example "Royal Road to Card Magic" is available for $4.00, pretty much a steal.
preserving magic one book at a time.