IWA 5 Reserves Junmai Daiginjo

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Tasting Notes

IWA 5 Reserves is a deeply layered expression shaped by time and careful blending. Crafted entirely from aged base sakes matured at Shiraiwa Kura, it opens with an expansive aromatic profile that gradually unfolds in the glass. Subtle floral tones lead into ripe pear and plum, followed by more mature nuances of brioche, pastry cream, cocoa, and gentle toasted notes. As it develops, hints of savory depth and spice emerge, adding dimension without heaviness. The palate is poised and harmonious, balancing maturity with vitality, and finishes long, refined, and quietly resonant.

Specifications

Region: Toyama, Japan
Class: Junmai Daiginjo
Rice: Yamada Nishiki, Omachi, Gohyakumangoku
Rice Polishing Ratio: 35%
ABV: 15%
Size: 720ml

Overview

IWA 5 Reserves represents a significant evolution within the IWA philosophy. Unlike the annual Assemblage releases, which emphasize freshness and seasonal expression, Reserves is built exclusively from older components that have been aged individually for several years. Some elements trace back to 2017, with an average maturation period of approximately four to five years. Rather than pursuing aging as a technical achievement, IWA approaches time as a tool to deepen balance, texture, and complexity.

This extended maturation is rare within the realm of Junmai Daiginjo, and Reserves embraces it deliberately to explore sake’s capacity for depth and serenity. Best enjoyed at room temperature in a white Burgundy glass, it can also be gently warmed to body temperature to reveal additional layers of aroma and structure. This is a contemplative sake designed to evolve slowly and reward attention.

Best Served: Room temperature (15–16°C) or gently warmed

Food Pairing: Seared scallops, butter-based seafood dishes, mushroom-forward cuisine, aged cheeses, and refined, umami-driven preparations.

About the Brewery

Shiraiwa K.K.

株式会社白岩

Shiraiwa K.K. produces IWA 5 in Tateyama at the Kengo Kuma-designed Shiraiwa Kura, which opened in 2021. IWA was founded by Richard Geoffroy.

Location

Tateyama, Toyama, Japan

Brewing philosophy

Remain true to Japanese tradition while using assemblage to create harmony across rice varieties, origins, yeasts, fermentation methods and reserve sakes.

SAKEZEN

Brewery Signature

• Assemblage
• Tateyama
• weightless harmony

Aromatic expression

Restrained Lifted

Rice character

Delicate Pronounced

Acidity

Rounded Bright

Harmony through assemblage. Blending distinct sake components brings IWA 5 its layered aromatics, integrated rice character and poised freshness.

SAKEZEN Team View is an editorial interpretation of official producer information, informed by our tasting perspective. Axis positions are qualitative, not laboratory measurements. Individual releases and personal impressions may vary.