Free shipping is for Japan Post (cargo ship or airmail).  

Japan Post only accepts cargo ship packages for many countries. See if shipping is restricted to your country here:  

We are seeing large delays on most packages sent via airmail, so Yamato  Transport/UPS will be faster for everyone. When Yamato Transport/UPS is  the same price, we will ship through them instead. See "Japan Post Airmail Estimates" below to find recent airmail deliveries.  

European countries will likely charge higher import duties on Yamato/UPS  shipments. Please confirm that you'd like to use Japan Air instead of  Yamato/UPS if you'd like to save more money.