The wine comprises 90% Steuben grapes from Yamagata prefecture and 10% Yama Sauvignon grapes from Iwate prefecture. It's a blend of destemmed Steuben grapes that underwent 12-14 days of skin fermentation in an amphora, along with a smaller portion of destemmed Yama Sauvignon grapes that were fermented on skins for 33 days. The wine was then aged in an amphora for 6 months.