Kozaemon Junmai Ginjo Bizen Omachi (300 ml)

Founded in 1702 by Nakashima Kozaemon, this Mizunami brewery made a deliberate commercial statement around 2001 by championing umakuchi — rich, umami-forward sake — at a moment when Japan's mainstream had spent three decades chasing the light, dry tanrei karakuchi ideal. That contrarian bet is most legible in this Bizen Omachi expression.

Bizen Omachi is one of Japan's oldest cultivated sake rice varieties, originating in Okayama Prefecture's Bizen region — a heritage grain prized for the pronounced amino-acid depth it contributes to the mash. Kozaemon sources Akaiwa Omachi or Bizen Omachi for its Junmai Ginjo tier, polished to ≤60% seimaibuai, allowing the rice's inherent earthiness and structural weight to survive the milling process.

Production centres on two technically distinctive choices: yamahai starter (a labour-intensive lactic-acid cultivation that amplifies umami and acidity over the faster sokujo method) and four-stage yodan fermentation — a fourth rice-and-water addition beyond the standard three-stage sandan shikomi, extending mash complexity and deepening rice-derived umami extraction. Koji is cultivated at approximately 98% humidity to maximise enzyme activity. Bottling employs the gravity-fill 'Piledriver' method to minimise oxidative stress. Water is drawn from an underground spring fed by snowmelt off Mt. Byobu in Mizunami's 70%-forested mountain microclimate — soft, mineral-light water that keeps fermentation clean at low temperatures.

The 300 ml format makes this an unusually accessible entry point into a rice variety — Bizen Omachi — that rarely appears at Junmai Ginjo polish in small-format bottlings. Drink now through near-term; the yamahai backbone rewards light chilling rather than full refrigeration.