In Japanese aesthetics, Ma argues that space is not emptiness but intention. What is left unsaid is often what gives form its clarity.
Koshu speaks a similar language.
Walking the floor at the KOJ Annual Trade Tasting 2026, what stood out was not an attempt to impress, but a growing confidence in restraint. These wines do not compete for attention — they hold it differently, through texture, balance, and quiet precision.
What can initially feel understated quickly reveals itself as control.
Because in Yamanashi, restraint is not a stylistic choice. It is hard-earned. Humidity, rainfall, and seasonal pressure demand meticulous vineyard work, down to the practice of protecting individual grape bunches. The discipline is invisible — until you taste the result.
Koshu is often described as delicate. After tasting across producers, that word feels slightly misplaced.
This is not fragility.
It is precision.
Koshu is finally talking about terroir, not just “Japan”
The best structural move this year was treating Yamanashi as a set of sub-zones rather than a single postcard.
- Yamanashi City / Fuefuki City (sandy gravel, granite influence, alluvial fans): often reads as cleaner, more linear, “easy to place” on an international palate.
- Koshu City / Katsunuma (historic core, mixed sediments, granite, volcanic ash nearby): more conversation about minerality, astringency, and textural signatures.
- Higher altitude areas (Hokuto, Nirasaki, Kai City): cooler nights, more tension, sometimes more overt smokiness or nuttiness in profile (whether you believe that is “soil” or “fermentation” is its own argument - the room clearly wanted to believe it is place).
And then there is the constant Yamanashi paradox: this is a landscape of vineyards embedded in everyday life. You stand among vines, then you suddenly look at houses, roads, and villages. It does not feel like a protected European monoculture. It feels integrated. That changes how you think about scale and intention.
The stylistic spectrum: stainless steel clarity, sur lie texture, skin contact, and “quiet” oak
Koshu is still rarely an aromatic show-off. The point is that the wines now carry more palate detail and finish character than they did 15-20 years ago.
The most convincing styles on the day:
- Lean, mineral, saline Koshu (stainless steel, low RS, high acid) - the “entry point” for sommeliers who want precision.
- Sur lie Koshu - where texture does the work: chalk, almond, gentle smoke, umami edge.
- Skin contact / orange expressions - Koshu can do this without turning heavy-handed. That is rare, and it is one of the most commercially interesting angles for the grape.
- Traditional method sparkling - still under-discussed in the mainstream narrative, but on the floor, it is one of the easiest ways to make people stop and pay attention.
What became increasingly clear as I moved from table to table was that Koshu is no longer defined by a handful of headline estates, but by a growing ecosystem of producers — from historic houses to technically ambitious wineries and large-scale operators building the category’s global future.
SUNTORY Tomi no Oka Winery
If you want one name that signals “Japan can play at the very top”, this is it.
What makes Tomi no Oka compelling is not only the trophy narrative, but the research culture behind the wines - work on parcels, clones, fermentation decisions, and disciplined handling that shows up as completeness in the glass. The masterclass described a “geekily managed” approach: parcel selection, whole-bunch decisions, partial malolactic, a touch of barrel time - not to “flavour” Koshu, but to build shape.
How it shows in the glass: compared to ultra-dry, hyper-linear examples, Tomi reads riper and rounder while still staying controlled. It is the kind of Koshu that makes sense in a Michelin dining room because it does not ask the guest to be “open-minded”. It just tastes resolved.
GRACE WINE
Grace is where Japanese minimalism becomes something real, not a cliché.
The house was unusually vivid because it focused on the Misawa family dynamic: the father as the established figure, and Ayana Misawa as the intensely technical, outspoken winemaker who redefined quality and direction. There was a line that made people laugh and told the truth: she openly critiques how her father used to make wine and how she had to step in and change it.
Why Grace matters now: they are a reference point for how Koshu can be dry, persistent, and quietly complex without cosmetic aromatics.
Food logic: Grace is the kind of wine that creates its own pairing vocabulary. It works with Japanese cuisine, obviously, but it is even more interesting with Western dishes that need precision rather than power - shellfish, asparagus, delicate sauces, dishes where acidity is your knife.
Château Mercian
Mercian is the historical bridge between Japan’s modern wine identity and global technique.
It is a big and important name with vineyards and wineries across regions, and a period where consultant winemakers (including serious Bordeaux experience) influenced their red program and general technical direction.
Why they are useful for trade readers: Mercian is often the proof that Japanese wine is not only “boutique romance”. It can be institutional, methodical, and export-facing.
What to taste for:In Koshu: a cleaner, more internationally readable line (think the “Chablis comparison”, with the caution that Koshu is not trying to mimic Chablis - it just shares a register of restraint).
In reds: the Syrah conversation is genuinely interesting here because it pushes against the expectation of “hefty Shiraz” and lands in a more lifted, peppery, structured style.
ARUGA BRANCA (Katsunuma Jozo)
Aruga is where the human story and the technical story meet.
Aruga was presented almost like a character in a film - a “terrific character”, with the kind of family presence where “they all look exactly like each other”, and a house that can be both traditional in spirit and large-scale in production.
Why Aruga works as a reference point: you can taste how Koshu can shift from clean, mineral to more gastronomic, layered, depending on choices like lees, élevage, and how hard you push the extraction or texture.
My take from the floor: Aruga’s wines can feel more “international-palate-ready” without losing their Japanese line. That is rare. It is also why they tend to serve as a benchmark in export conversations.
Lumière Winery
Lumière is history you can drink.
Founded in 1885, Lumière sits at the intersection of heritage and experimentation. The masterclass highlighted their range, including sparkling and orange expressions, and the broader point that Koshu can handle oxygen and build texture without becoming clumsy.
What stood out in tasting:
- Traditional method sparkling Koshu: clean, precise, and genuinely “restaurant-useful”.
Sparkling/orange expressions: the more textural side of Koshu, where lees and oxidative handling can bring brioche, almond, gentle smoke - but the grape’s restraint keeps it from becoming heavy.
Lumière is also one of the easiest tables to sell in writing because the hook is honest: this is not a new category trying to look old. It is an old house proving it can stay current.
KURAMBON WINE
Kurambon is where “natural” is a discipline, not a costume.
It is a family house and the almost Zen-like pruning visuals in the vineyard, but the point was practical: minimal intervention, indigenous yeast, no cosmetic manipulation, and a desire to let the vineyard speak even if that means the wine is less “obvious” on the nose.
Why it matters in 2026: the global trade conversation is tired of fake “authenticity”. Kurambon’s strength is that the approach reads as conviction rather than trend-chasing.
IWASAKI JOZO
If Katsunuma is considered the historical cradle of Koshu, then Iwasaki Jozo belongs to that deeper narrative - one where wine is not an imported idea but a local craft shaped by farmers long before Japan appeared on global wine maps.
The house traces its roots to cooperative production models, and that origin is still evident in the wines. There is a quiet resistance to over-stylisation here. Instead of chasing aromatic drama or fashionable texture, Iwasaki leans into restraint - wines that feel culturally Japanese rather than technically European.
What becomes immediately clear in the glass is balance without interventionist fingerprints. Alcohol remains moderate, acidity integrated rather than aggressive, fruit expression controlled. These are not wines built to impress in a blind tasting lineup; they are wines built to accompany food and disappear gracefully at the table.
And that is precisely their strength.
In a global market increasingly saturated with wines engineered for attention, Iwasaki reminds us that subtlety is not weakness - it is intent.
For sommeliers, this is the kind of producer that quietly earns repeat placements because the wines behave predictably with cuisine. For writers, it is a reminder that authenticity often lives outside the spotlight.
Editorial angle: Iwasaki represents continuity - proof that Koshu is not a trend but a living regional tradition.
FUJICLAIR WINERY
Fujiclair sits slightly outside the romantic storytelling that often surrounds Japanese wine, and perhaps because of that, it deserves closer attention.
With vineyards at higher elevations in Yamanashi, the estate operates in a naturally cooler environment. The resulting wines tend to show tighter structure, sharper definition, and a more architectural palate shape.
What stood out most during tasting was their handling of lees.
Sur lie ageing is sometimes used as a cosmetic tool - a way to pad naturally neutral varieties with creaminess. Fujiclair approaches it differently. Here, lees contribute tension rather than softness, building a faintly savoury dimension that extends the finish rather than rounding it.
You notice chalk, subtle almond, sometimes a whisper of smokiness - but never heaviness.
This matters because one persistent misconception about Koshu is that delicacy equals simplicity. Fujiclair quietly dismantles that idea. These are textural wines. Intellectual wines, even.
There is also a technical confidence at play - wild fermentation choices, careful oxygen management, and a willingness to let structure lead rather than aromatics.
For the trade, Fujiclair signals where the category may be heading: toward whites that are less about fragrance and more about mouthfeel.
Watch this space. Producers who master texture tend to shape the next stylistic chapter of a region.
MANNS WINES
It is easy - and intellectually lazy - to dismiss large producers when writing about emerging fine wine regions. Manns Wines is exactly why that reflex should be resisted.
Founded under the umbrella of the Kikkoman group, Manns carries the operational discipline you would expect from a major Japanese company. But what is interesting is how that precision translates into the glass.
The wines are clean. Technically composed. Free from excess.
Nothing feels accidental.
Their Koshu expressions typically sit in a very controlled analytical range - moderate alcohol, defined acidity, carefully managed residual sugar - creating wines that are immediately legible to an international palate without sacrificing regional identity.
And here is where Manns becomes strategically important.
For Koshu to succeed globally, the category cannot rely solely on boutique producers. It needs houses capable of scale, consistency, and export reliability. Sommeliers may discover the grape through artisan names - but markets are built on dependable supply.
Manns provides that backbone.
There is also an understated elegance to the style. Rather than pushing experimentation, the estate seems committed to clarity - wines that communicate the variety without distortion.
Think of them less as disruptors and more as stabilisers of the category.
Every serious wine region has such producers. Burgundy, Champagne, Napa - none function on cult estates alone.
Koshu is reaching the stage where this infrastructure matters.
The point for the trade: Koshu is not asking for sympathy anymore
The best closing line is basically a challenge: why keep defaulting to the same tired options when a category like this can refresh a list?
I would sharpen it even further:
Koshu is not “interesting because it is Japanese”. It is interesting because it has become a precision-driven white wine category with a real internal spectrum - stainless steel purity, lees texture, skin-contact character, and sparkling legitimacy - and because the producers now have enough confidence to talk about place, not only identity.