I have it in Photos for Mac, not iPhoto.
Sorry, that was a bit confusing, because you wrote iPhoto and posted in the iPhoto forum.
Are you living in Japan?
You can only order a book from a print products store in the country where you are currently living - the country for the Apple ID, the country of the delivery address, and for the credit card or payment method need to be the same.
The country for the Print Product Store you order from is selected in the Photos > Preferences > General:

And the details for your account have to be set up in the Photos menu:

If your credit card has been issued in a different country, it is best to have the book shipped to your home address, and then forward it yourself. This way you can check the print quality before you send it on to the recipients.