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: https://www.post.japanpost.jp/int/information/overview_en.html
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.