Kita No Nishiki Kuragakoi Kanjuku Hizo Junmai 720ml

Founded in 1878, Kobayashi Shuzo began with a rather ambitious mission: to help encourage rice cultivation in the then-underdeveloped northern reaches of Hokkaido. Situated along the magnificent Yubari River, the brewery has spent nearly 150 years proving that Japan’s frozen north can produce some seriously compelling sake.

But this particular bottle has a story that goes a little deeper. Literally.

Inspired by Hokkaido’s coal-mining heritage, this Junmai is matured underground in an abandoned coal mine. It sounds like something pulled from local folklore—a forgotten bottle of sake hidden deep inside a mine, only to be rediscovered years later—but there’s actually some very clever science behind the romance.

Deep underground, the old mine tunnels remain naturally dark and remarkably stable, hovering around 57–59°F throughout the year. No sunlight, no UV exposure and, most importantly, none of the dramatic seasonal temperature swings that can make long-term sake aging rather tricky.

So down into the darkness the sake goes, where it can rest quietly and mature at its own pace.

Made from Hokkaido-grown Kitashizuku rice, polished to 65%, this Junmai develops into a richer, rounder expression of sake. Time softens the sharper edges while encouraging deeper, more savory and earthy characteristics, along with the mellow complexity associated with Koshu, or aged sake.

At 16–18% ABV with an SMV of -5, there’s some richness here too—a slightly sweeter, fuller personality that plays beautifully against the depth created by aging.

It’s part sake, part Hokkaido history, and part underground science experiment.

And apparently, some treasures really are better left buried for a while.