Osuzuyama (尾鈴山) is a mountain, not a company. It is a 1,405-metre peak in the interior of Miyazaki Prefecture on Kyushu, known locally for the more than thirty waterfalls fed by roughly 3,000 millimetres of rain a year. Osuzuyama Distillery, built at the mountain’s base in 1998 by the Miyazaki shochu producer Kuroki Honten (黒木本店), takes its name from the mountain rather than the company — and the mountain, more than any marketing decision, is the reason the distillery sits where it does.
This guide covers why a shochu brewer founded in 1885 put a whisky still in one of the wettest, hardest-to-reach corners of Kyushu, how shochu-distilling technique still shapes the way the whisky is made there, and what a small, still-shifting lineup — built around a cask wood almost no other Japanese distillery uses — actually consists of. As with all of our distillery coverage, we have not tasted Kuroki Honten’s whisky and make no claims about how it drinks.
A shochu house’s detour into whisky
Kuroki Honten was founded in 1885 in Takanabe, a town on Miyazaki’s coast, and built its reputation on shochu brands that are still its best-known products today: Hyakunen no Kodoku (百年の孤独), Kiroku (㐂六), and Nakanaka (中々). Whisky came much later, and by a roundabout route. In 1998, the company opened a separate workshop about 40 minutes by mountain road from its Takanabe headquarters, along the Komaru River — at that point purely a shochu operation, making brands called Yamaneko (山ねこ) and Yamazaru (山猿).
According to the Japanese Whisky Information Center (JWIC), the decision to place that workshop so far from the main plant traces to Kuroki Toshiyuki, the company’s president at the time, who had visited Scotland’s Edradour distillery and came away determined to seek out an equally out-of-the-way site rather than build somewhere convenient. Toshiyuki has since left day-to-day management for local politics — he is now the mayor of Takanabe — and it was his second son, Kuroki Shinsaku, who took the mountain workshop into whisky, beginning distillation there in November 2019, more than two decades after the building itself went up.
Choosing isolation on purpose
The remoteness bought the distillery water, not scenery. The site draws from upstream sections of the Komaru River near Mt. Osuzu, at a measured hardness of 7.5 — soft water, in a region the company’s own materials describe as fed by roughly 3,000 millimetres of rain annually and more than thirty waterfalls, including Yaken Falls (矢研の滝). The whisky distillation building itself is modest: a single-storey wood structure with a floor area of about 112 square metres, sited at roughly 190 metres above sea level.
That isolation is also a practical warning for anyone hoping to visit. JWIC’s distillery database lists no visitor centre and no public tours at Osuzuyama, which lines up with a site the company chose specifically to be hard to reach. Readers who want an in-person Japanese distillery visit are better served looking at operations built for it, such as Yamazaki, which runs regular public tours.
Distilling like a shochu house, not a Scotch one
Osuzuyama’s still house holds four pieces of equipment: two stainless-steel shochu-type stills, one copper pot still built for whisky, and one small pot still for gin and other spirits. Whisky production runs through two of them in sequence — an initial distillation in a shochu still, followed by a second distillation in the copper whisky still, a straight-type pot made by Miyake Seisakusho with a 3,300-litre capacity. That is a genuinely different path from most Japanese single malt, which is typically run entirely through stills purpose-built for whisky from the start; at Osuzuyama, the whisky line was grafted onto shochu infrastructure that already existed.
Fermentation happens in fifteen wooden tubs made from Miyazaki cedar, shared between the shochu and whisky operations, feeding a 4,000-litre stainless mash tun in batches of around 800 kilograms of malt — small by the standards of Japan’s larger distilleries. The malting itself is done entirely by hand: workers spread malt in stainless steel vats inside a large greenhouse rather than using mechanised floor-malting or buying in malt from a commercial maltster, a labour-heavy choice the company’s own materials describe as central to the site’s approach.
Growing the grain themselves
Most small Japanese craft distilleries buy malted barley from commercial maltsters, often imported. Kuroki Honten instead runs its own agricultural producer association, Yomigaeru Daichi no Kai (甦る大地の会, roughly “the revived earth association”), which grows barley varieties including Harushizuku and Haruka Nijou through contracted farmers rather than the open market; per JWIC, the current grain is sourced from neighbouring Oita Prefecture. The malt is non-peated. The same association grows the raw materials for at least one of the company’s shochu releases too: Osuzuyama’s own online shop describes the sweet potato and Yamada Nishiki rice behind its Yamaneko shochu as grown organically, without pesticides, by Yomigaeru Daichi no Kai. That detail suggests the barley project is less a whisky-specific gesture than an extension of a sourcing philosophy Kuroki Honten already applied across its core business, whisky included almost as an afterthought.
It is a similar instinct to the one behind Nukada distillery in Ibaraki, another case of a drinks maker repurposing its existing raw-material relationships rather than building a whisky supply chain from zero. What differs at Osuzuyama is the scale of control: growing the grain itself, rather than sourcing a specific variety from an outside farm, gives the distillery a direct line from field to mash tun that few operations of its size maintain.
A chestnut cask, and a lineup that keeps shifting
Osuzuyama’s whisky releases since 2019 read less like a fixed core range and more like a running experiment. OSUZU MALT New Make and OSUZU GIN launched together in 2020; an 18-month New Make and OSUZU MALT New Born followed in 2021; a 27-month expression aged in Miyazaki cherry wood and American oak, plus a matching New Born, arrived in 2022. 2023 brought Chestnut Barrel and Cedar Barrel releases — chestnut in particular is a cask wood essentially no other Japanese distillery uses — along with a commemorative bottling for that year’s Whisky Festival in Osaka. A Sakura Barrel followed in 2024, the same year the distillery supplied whisky for “26” (トゥエンティシックス), a collaboration bottling co-created with Korean actor Park Seo-jun and the Tokyo company STARBASE: 10,000 individually serial-numbered bottles at 43% ABV, sold only in Japan, according to STARBASE’s own press release. An American Oak Barrel expression followed in 2025, and a new Chestnut Barrel batch in 2026.
As of this writing, three OSUZU MALT single malt expressions make up the standing lineup on the distillery’s official site:
| Expression | ABV | Cask | Notes |
|---|---|---|---|
| OSUZU MALT American Oak Barrel | 46% | American oak | 200ml and 700ml |
| OSUZU MALT Chestnut Barrel | 59% | Miyazaki chestnut and American oak | 200ml and 700ml |
| OSUZU MALT New Born | 59% | Chestnut and American oak | Aged 18 months |
None of the three were listed for individual sale on the distillery’s official online shop at the time of writing; past batches have sold through limited windows rather than standing stock, consistent with a batch size of roughly 800 kilograms of malt at a time. No export programme has been announced. OSUZU MALT New Born won a silver award at the Tokyo Whisky & Spirits Competition in 2022, and the distillery received a 2023 TWSC SDGs award; a same-year gold medal recorded for the operation was for its Yamaneko shochu, not the whisky, a distinction some secondary coverage blurs.
What this means if you find a bottle
A bottle of Osuzu Malt is not a whisky built from scratch to chase the 2010s Japanese whisky boom. It is a sideline grafted onto a 19th-century shochu producer’s existing plant, staff, and grain relationships: distilled twice through equipment shared with shochu, malted by hand rather than bought in, made from barley the company grows through its own farming association, and finished in a regional cask wood, chestnut, that almost nothing else on the market uses. None of that is a claim about how it tastes — we have not tried it — but it is a genuinely different set of production decisions from the majority of Japan’s newer craft distilleries, closer in spirit to how Sakurao carried gin-making habits into single malt, or how Nagahama runs one of the country’s smallest whisky operations on repurposed equipment.
Because there is no visitor centre, no confirmed export route, and no standing online listing, the realistic way to find a bottle is through Japanese specialist retailers or auction listings when a limited release surfaces — the same route that applies to most of the smaller entries in our full list of Japan’s whisky distilleries. Buyers drawn to the chestnut cask specifically should treat it the way they would treat any less-common Japanese wood, such as mizunara oak: a genuine point of difference worth seeking out, not a guarantee of quality on its own.
The “26” collaboration with Park Seo-jun is a useful sanity check on how small this operation still is. Ten thousand bottles sounds substantial next to a distillery running 800-kilogram batches, but STARBASE’s own materials describe it as a blend of spirits and malt rather than a single malt whisky proper, and it sold only in Japan. It is evidence that Osuzuyama has drawn outside attention beyond the trade press that usually covers Japan’s smaller distilleries — not evidence that the core OSUZU MALT range has scaled up to match.
Frequently asked questions
Q: What company owns Osuzuyama distillery?
A: Kuroki Honten (黒木本店), a Miyazaki Prefecture shochu producer founded in 1885 and best known for the shochu brands Hyakunen no Kodoku, Kiroku, and Nakanaka. The company built the Osuzuyama site as a shochu workshop in 1998 and began distilling whisky there in November 2019, under Kuroki Shinsaku, son of the company’s previous president.
Q: Why does Osuzuyama’s whisky pass through a shochu still?
A: According to the Japanese Whisky Information Center, Osuzuyama runs two stainless-steel shochu-type stills alongside one copper whisky pot still, and whisky production uses both in sequence: an initial run through the shochu still, then a second distillation in the copper pot still. The setup reflects how whisky-making was added onto existing shochu equipment rather than built as a separate system.
Q: What is the Yomigaeru Daichi no Kai barley project?
A: It is an agricultural producer association that Kuroki Honten itself runs, growing barley varieties including Harushizuku and Haruka Nijou through contracted farmers rather than buying malt on the open market. The malt is non-peated, and Osuzuyama malts it entirely by hand in stainless vats set up inside a greenhouse next to the distillery.
Q: Can you visit Osuzuyama distillery?
A: No. The Japanese Whisky Information Center’s distillery database lists no visitor centre and no public tours at Osuzuyama, consistent with a site the company has said was deliberately chosen for its remoteness. Readers wanting an in-person Japanese distillery visit should look at operations that do run public tours, such as Yamazaki.
Sources
- Osuzuyama Distillery official site, company, land, and production philosophy pages (Japanese)
- Japanese Whisky Information Center (JWIC), distillery database entry for Osuzuyama, updated April 2026 (Japanese)
- STARBASE Inc., press release via PR TIMES on the “26” whisky collaboration, December 16, 2024 (Japanese)