Koshimeijo is located in Tochio, Nagaoka City, Niigata Prefecture.

Founded in 1845, the brewery draws on the rich natural blessings of Tochio’s majestic mountains. Today, Koshimeijo produces three distinct brands—Koshi no Tsuru, Ichijo, and Yamashiroya—each with its own unique concept and philosophy.

Among them, Yamashiroya, launched in 2007, stands out as a rare presence in Niigata, as all of its sake is brewed exclusively using the traditional kimoto method.

The philosophy of Yamashiroya is what the brewery calls “the ultimate subtraction.”
Rather than relying on showy aromas, the sake quietly refines the natural power of rice and water. Gentle acidity born from kimoto brewing and a clear, focused umami come together to evoke the calm and stillness of the surrounding mountains.

The brewery is currently led by Masashi Yoshihara, who previously worked as a master fireworks craftsman. Having captivated audiences with the spectacular yonshakudama, the world’s largest firework shell, he now expresses his craftsmanship through sake—bringing a quiet, lasting sense of emotion to those who experience it.