Fujiizumi is the sake brand of Ida Shuzo, one of Gunma Prefecture's oldest breweries, tracing its sake-making history to the early Meiji period in Tamamura Town in the Tone-Karasu river basin. The brand name means 'an inexhaustible spring that flows without end,' reflecting the brewery's aspiration for enduring quality rooted in the region's groundwater. The lineup shifted over time from sweeter styles to a clean, dry character designed to complement Japanese cuisine.