I agree that the checkout process at Rakuten is confusing. It took numerous attempts for it to go through. Ultimately, when it did, I wasn't quite sure why the last attempt worked, but it did. After that, I was contacted directly from the store (in English, not perfect, but quite understandable). After that, it was pretty straightforward. I paypal'ed them and they sent a confirmation email. The place I ordered from seemed quite happy to fulfill an international order. That said, as I have reasonable skills in Japanese, the communication wasn't that problematic, but if you can't read/write Japanese, I can see how the process would be daunting.