here's the link. it might be difficult to reserve a copy at this point in time, unless you live in Japan.
http://taketake.cc/arwcart/cart.cgi?...tail&no=000006
There's a good chance it will appear on Amazon Japan in the future, where you can at least pay for it with a card. When I tried to go through the above store to get the ARW CD, I remember that bank transfer was the only method of payment. So probably best to wait for Amazon.