Yuasa Soy Sauce, produced by Marushin Honke at the Kuyogura Brewery, represents the living heart of Japan’s soy sauce heritage. Using time-honored natural fermentation methods, this brewery continues to make soy sauce just as it was in the Edo period—slowly, patiently, and without mechanical shortcuts. Inside the wooden brewery, visitors can sense the warmth of fermenting moromi and learn how soybeans, wheat, salt, and kōji mold come together through months of transformation. Each wooden vat, aged for decades, tells the story of generations of brewers who mastered the art of time and taste. Yuasa Soy Sauce is more than a condiment—it is the origin of Japan’s culinary identity.

Jinburo, a preserved public bathhouse in Yuasa’s historic district, offers a glimpse into the daily life of the Edo period. Once a place where brewers and merchants gathered after long days of work, it now serves as a small museum showcasing the social culture of Japan’s traditional towns. The wooden tubs, tiled walls, and nostalgic atmosphere evoke a time when bathing was not just for cleansing but for community and relaxation. Visiting Jinburo reveals another side of Yuasa’s heritage—how a town built on craftsmanship also valued the warmth of shared human connection.

Founded over 170 years ago, Kadocho Soy Sauce Brewery is the oldest operating soy sauce brewery in Yuasa—and the only one in Japan that still produces soy sauce exactly as it was made centuries ago. Every step of the process remains unchanged: natural fermentation in wooden barrels, hand mixing of moromi, and aging over many months under the care of skilled craftsmen. No machinery is used; instead, time, temperature, and intuition guide the process. Kadocho is not simply a historical site—it is a living testament to Japan’s fermentation culture, where the balance of nature and craftsmanship continues to create flavor the world has never forgotten.