Tsunan Sake Brewery Co., Ltd. (Headquarters: Tsunan Town, Nakauonuma District, Niigata Prefecture; President: Kengo Suzuki; hereinafter “Tsunan Sake Brewery”) participated in the “Uis’mas Party,” a Christmas event hosted by Uvance Innovation Studio (UIS)*, held on Wednesday, December 17, 2025, at Fujitsu Uvance Kawasaki Tower in Kawasaki City, Kanagawa Prefecture.
- Uvance Innovation Studio (UIS): An open innovation facility established by Fujitsu Limited within Fujitsu Uvance Kawasaki Tower in Kawasaki City, Kanagawa Prefecture.
This event was organized as an open networking opportunity bringing together startups and corporate representatives. Participants from diverse backgrounds—who do not often have the chance to interact—engaged in lively exchanges over light food and drinks. In addition to networking, the party featured games and surprise activities, creating a warm and welcoming atmosphere throughout the evening.
At the event, Tsunan Sake Brewery introduced its premium flagship product, “GO GRANDCLASS Uonuma Koshihikari Edition.” This sake is a limited-edition release from the Grandclass series, carefully brewed using Uonuma-grown Koshihikari rice. Its rich flavor profile and exceptional quality drew strong interest from many attendees. Through tastings and product introductions, the event provided a valuable opportunity for visitors to gain a deeper understanding of Tsunan Sake Brewery’s craftsmanship and brand philosophy.
Tsunan Sake Brewery will continue to actively engage with innovation communities such as this, sharing the appeal of its products that fuse traditional brewing techniques with contemporary sensibilities.
About GO GRANDCLASS Uonuma Koshihikari Edition
GO GRANDCLASS Uonuma Koshihikari Edition is the highest-tier sake in Tsunan Sake Brewery’s “GO” series, representing the pinnacle of quality in both ingredients and brewing methods. It is crafted using premium Koshihikari rice grown in the renowned Uonuma region—one of Japan’s most celebrated rice-producing areas—and brewed with pristine snowmelt water from Tsunan, a heavy snowfall region.
By drawing out the distinctive umami and elegant sweetness characteristic of Uonuma Koshihikari, and applying Tsunan Sake Brewery’s advanced expertise in microbial control and fermentation technology, this sake achieves both remarkable clarity and depth of flavor.
Blending the unique character of the land (terroir) with the science of sake brewing, this product excels as a food-pairing sake and embodies Tsunan Sake Brewery’s vision of “Japanese sake for the future.”
GO GRANDCLASS Uonuma Koshihikari Edition website: https://koshihikari.tsunan-sake.com/
About Uvance Innovation Studio (UIS)
Uvance Innovation Studio (UIS)—commonly known as “UIS”—is an open innovation hub established by Fujitsu Limited within Fujitsu Uvance Kawasaki Tower in Kawasaki City, Kanagawa Prefecture. It serves as a collaborative platform where companies, startups, research institutions, local governments, and individuals come together across national and industry boundaries to co-create new value and address social challenges.
UIS operates under the concept of “Borderless Innovation Gateway,” aiming to spark innovation through encounters between ideas and people. The facility offers members-only collaboration spaces and hosts a variety of events to promote cross-industry co-creation.
Uvance Innovation Studio website:
https://fj-uis.com/
About Tsunan Sake Brewery
Tsunan Sake Brewery Co., Ltd. is a sake brewery based in Tsunan Town, Nakauonuma District, Niigata Prefecture—one of Japan’s heaviest snowfall regions. The brewery uses natural spring water sourced from mountains rising over 2,000 meters as its brewing water. Guided by its brand concept, “Brew for Future – Brewing a Coexistent Future,” Tsunan Sake Brewery crafts sake using locally sourced rice varieties such as Gohyakumangoku and Uonuma Koshihikari.
In 2025, the brewery was awarded the Niigata Governor’s Prize (1st Place) at the Echigo-style Sake Brewing Technology Competition, a prestigious contest evaluating advanced brewing techniques.
Tsunan Sake Brewery website:
https://tsunan-sake.com/
