Dassai Junmai Daiginjo 45 (1.8 L)

When Hiroshi Sakurai launched the Dassai brand in 1990, he made a commitment with no precedent in commercial sake: every expression in the range — including this 1.8 L magnum of the 45 — would be Junmai Daiginjo, the category's highest grade, with zero added distilled alcohol. No other major Japanese brewery has matched that single-tier discipline.

The brewery sits deep in a mountain valley in Shuto-cho, Iwakuni City, Yamaguchi Prefecture — a region historically classified for its soft, ultra-pure 'Seiryu' mountain water, purified further on-site. Soft water yields a slower, cooler fermentation and a silkier mouthfeel; it is the primary terroir driver here in the absence of soil variables.

The 45% seimaibuai means 55% of each Yamada Nishiki grain has been milled away before brewing begins. Rice is washed in 10 kg hand-batches in running water, soaked approximately 15 minutes, and fermented in small individual tanks with manually applied koji — human hands, not automation. Two parallel brewing teams run simultaneous fermentations at differing water absorption rates and temperatures, comparing results batch by batch. Dassai was the first sake brewery in Japan to deploy a centrifuge commercially (c. 2000), separating sake from mash without pressure to preserve delicate aromatic integrity. Bottling uses the patented Hayata low-temperature pasteurization method (Patent 2013-008455): filled cold, shower-pasteurized, immediately rapid-cooled.

The 1.8 L format slows oxidation post-opening and is brewed year-round — a deliberate break from traditional winter-only brewing — ensuring consistent freshness regardless of purchase date.