Ouroku is produced by Ouroku Shuzo, founded in 1872 in Matsue, Shimane Prefecture, a brewery that has built its identity around radical transparency in the bottle. Every sake is released unfiltered, bottled without blending across tanks, stored at sub-zero temperatures, and subjected to only minimal heat pasteurization, so that drinkers can taste the distinct character of each individual brewing batch. The result is a concentrated richness with layered sweetness and clean acidity, sustained by strict cold chain management from cellar to consumer.