Azumatsuyu is produced by Itoshuzojo, a sake brewery founded in 1854 in Azuma Town, Unzen City, Nagasaki Prefecture, drawing its brewing water from the mountain springs of Azuma. The brand name reflects this local water source, combining the character for east (Azuma) with the word for dew or moisture, evoking the pure natural character of its source region. The brewery produces sake rooted in the Nagasaki regional tradition, using the distinctive mineral quality of Azuma mountain spring water.
