GO GRANDCLASS — the flagship

GO GRANDCLASS (Uonuma Koshihikari Edition) is the flagship of Premium Table Rice Sake—the product that carries the category to the world.

The bottle

• Name. GO GRANDCLASS — Uonuma Koshihikari Edition (the same edition name is used overseas, including Taiwan).
• Rice. 100% Uonuma Koshihikari—edible table rice, not sake rice.
• Type. Junmai daiginjo.
• Method. Traditional brewing fused with AI-assisted "Smart Brewing."
• Position. The top of the GO series and the flagship of the Premium Table Rice Sake category.
• Presentation. Delivered in a paulownia-wood box, with a serial-numbered wooden tag (limited production).

Confirmed specifications such as polishing ratio are published by the brewery at tsunan-sake.com.

Awards

• Kura Master 2024 Gold Award — Junmai Daiginjo category. GO GRANDCLASS Uonuma Koshihikari Edition (competition held in France). Also announced by the brewery: tsunan-sake.com.
• Milano Sake Challenge 2025 Platinum — GO GRANDCLASS Uonuma Koshihikari Edition.
• Echigo-Style Sake Brewing Technical Competition (FY Reiwa 6) — Niigata Governor's Award, 1st place — awarded to the "Tsunan" label (a separate brand; highlighted at Supermarket Trade Show 2026).

Why it matters to the category

A category needs a proof point. GO GRANDCLASS is the external validation that 100% Uonuma Koshihikari—rice bred for the table—can become an award-winning premium sake. It is described as a terroir-driven product: the snow country of Tsunan expressed in the glass, with measured nanoparticle data placed beside the taste.