You first have to register an account sin.. if u know japanese it would be much easier.. rakuten is now starting to have english version..i haven't try that yet..as i get used to the japanese version..
in Rakuten..many different stores carry the same items with diff prices..so u have to go inside each store and look at their payment method and shipping.. some of them will clearly list out "we do not ship outside japan" and some will say "we ship internationally"..when u register the account.. u will need to add the shipping address.. u can use canada address..no problem...if u are outside canada..when u check out u goods..they will send u confirmation email..and the store will email you with the shipping rate (usually the next day)..at that time u can tell them either u accept & proceed the order..or rejected the order if the shipping rate is high..
even they reply saying they do not ship outside japan..but u really really want it.. u can send the goods to a shipping agency in japan..and they can ship that out for u..