First create a new user and set up anew account. Once you choose Japan on the first screen everything will be in Japanese.





the next screen is the address screen, and it is laid out differently than the English. I just put a three digit number in the top field and junk in the rest.
after that just continue through with the choice on the bottom right of each screen.
I didn't want to wait on shipping for a PSN number, so I used these guys (they email the number):
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... TQ:US:1123
here is a store that will do it:
http://www.japan-exportonline.com/store/home.php?cat=78
that's all for now. hopefully someone else can post all the available shmups on the Japan store.