Around 9 kg of unpolished rice is required to produce a single 720ml bottle. Of that rice, 92% is polished away, leaving only the innermost 8% for brewing.

TATENOKAWA Kyokugen is a Junmai Daiginjo created by TATENOKAWA Brewery in Sakata, Yamagata, as an exploration of how far the category can be taken.

It is made entirely from Yamada Nishiki grown in Hyogo Prefecture.

The rice is polished over approximately 40 days to an extraordinary 8% polishing ratio.

Since its debut in 2013, Kyokugen has remained one of TATENOKAWA’s flagship expressions, representing the brewery’s pursuit of what it calls “The Pinnacle of Junmai Daiginjo.”

An 8% polishing ratio means removing 92% of the rice

The rice polishing ratio shown on a sake label indicates how much of the original grain remains after polishing.

So, an 8% polishing ratio means that:

92% of the grain is removed, leaving only the central 8% for brewing.

For Kyokugen, Yamada Nishiki is polished for around 40 days until each grain is reduced to roughly 2mm in diameter.

According to TATENOKAWA, around 9 kg of unpolished rice is required for a single 720ml bottle.

But Kyokugen is not simply a sake defined by how much rice has been polished away.

The more important question is what can be drawn from what remains.

Why polish the rice this far?

The outer layers of rice contain relatively higher levels of proteins, fats and other components that can influence the character of sake.

By polishing further into the grain, brewers can pursue greater clarity and refinement.

That does not mean, however, that a lower polishing ratio automatically produces better sake.

TATENOKAWA has been explicit that its aim is not simply to compete over numbers. Rather, its approach to high polishing is part of a broader exploration of what highly refined rice can express in sake.

Kyokugen is therefore less about the number “8” itself than about the brewing techniques required to make that 8% meaningful.

Brewing rice polished down to 8%

Rice polished to this degree requires particularly careful handling.

Kyokugen is brewed in small batches, with the temperature of the moromi, or main fermentation mash, controlled in increments as precise as 0.1°C.

The current expression is brewed in TATENOKAWA’s new brewing facility, completed in 2021.

The brewery describes the updated environment as allowing for more precise production and contributing to a sake with greater aroma, freshness and definition.

Polishing Yamada Nishiki to 8% is one challenge.

Turning those tiny grains into a balanced sake is another.

The real significance of Kyokugen lies not only in its polishing ratio, but in the brewing skill required after the polishing is complete.

100% Yamada Nishiki

Kyokugen is made entirely from Hyogo-grown Yamada Nishiki, one of Japan’s most highly regarded sake rice varieties.

That rice is polished to just 8%, then carefully brewed to create a sake that combines aromatic lift with freshness, definition and depth.

TATENOKAWA describes Kyokugen as bringing together aroma, delicacy, fullness and a long, elegant finish.

Extreme polishing does not necessarily mean an extremely light or neutral sake.

In Kyokugen, clarity is accompanied by the richness and umami of the rice.

The interest lies not in how much has been removed, but in what can still be expressed through the 8% that remains.

A brewery devoted entirely to Junmai Daiginjo

To understand Kyokugen, it helps to understand TATENOKAWA itself.

The brewery traces its origins to the 19th century in Yamagata.

In 2010, it became the first brewery in Yamagata Prefecture to produce only Junmai Daiginjo sake, making the category not simply a premium tier within its range, but the foundation of its entire sake production.

Kyokugen was introduced three years later, in 2013.

Rather than treating Junmai Daiginjo as a special exception, TATENOKAWA had already built its identity around the category.

Kyokugen emerged from that environment as one of the clearest expressions of the brewery’s pursuit of refinement.

From 8% Kyokugen to 1% Komyo

TATENOKAWA’s exploration of ultra-high polishing did not stop at 8%.

The brewery later created Komyo, using rice polished to just 1%.

Its wider range now includes expressions at different polishing ratios, with Kyokugen occupying an important place in the development of this approach.

Seen in that context, the 8% figure is not simply an isolated technical achievement.

It represents a stage in TATENOKAWA’s continuing exploration of how far Junmai Daiginjo can be refined.

Yamagata craftsmanship beyond the sake itself

The current presentation of Kyokugen also incorporates a traditional material from Yamagata.

Its label is made using Miyama Washi, a local traditional paper valued for both its strength and its soft, warm texture.

The former wooden box has also been replaced with a refined white presentation box, intended to reflect the sake’s elegance and freshness.

The result is a presentation that connects the sake not only with advanced brewing technique, but also with the craft culture of its home prefecture.

Best enjoyed chilled

TATENOKAWA recommends serving Kyokugen chilled, at around 5–10°C.

As the sake gradually warms in the glass, its aroma, umami and finish can begin to show different dimensions.

The brewery suggests delicate dishes such as Kyoto-style yuba, while also recommending richer pairings including blue cheese and Gouda.

That range makes Kyokugen interesting not only alongside Japanese cuisine, but wherever its aroma, texture and lingering finish can be given room to develop.

What lies beyond 8%

92% removed.

Around 40 days of polishing.

Approximately 9 kg of unpolished rice for one bottle.

Fermentation managed to within 0.1°C.

The numbers immediately show that Kyokugen is made under very different conditions from an ordinary Junmai Daiginjo.

But the numbers are not the final point.

The more important question is what TATENOKAWA sought to create through them.

Aromatic lift.

Clarity.

Umami.

Fullness.

And a long, composed finish.

Kyokugen turns an 8% polishing ratio from a technical specification into the starting point for a complete sake.

That is what gives this bottle its place within TATENOKAWA’s pursuit of the pinnacle of Junmai Daiginjo.

TATENOKAWA Junmai Daiginjo Kyokugen

Yamagata, Japan | Junmai Daiginjo | 100% Hyogo-grown Yamada Nishiki | 8% Rice Polishing Ratio | 720ml | 15% ABV

Introduced in 2013, Kyokugen has become one of TATENOKAWA’s flagship sake expressions.

Yamada Nishiki is polished over approximately 40 days to just 8%, then brewed in small batches with precise fermentation-temperature control.

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