We finally updated our shipping option.
FedEx is one of the world’s largest express transportation companies, FedEx offers a wide range of shipping services to more than 220 countries and territories. Your postage is calculated manually and it is determined by either volumetric weight or the total weight whichever greater.
NOTE: Additional fee applies when volumetric weight calculation applies to your order and if you are located out of delivery area (please check URL below).
https://www.fedex.com/content/dam/fedex/us-united-states/services/Zipcodes_OPA_ODA.pdf
P.S If you wish us to ship your order by Japan Post SURFACE (by sea) then please do not hesitate to contact us.