Hoshiizumi is brewed by Maruichi Shuzo, founded in 1917 in the Chita District of Aichi Prefecture, where the brewery's well water reflects the night sky, giving rise to the brand name meaning star spring. The brewery has won gold prizes at the National New Sake Awards for nine consecutive years, building a reputation for consistent technical excellence. Maruichi is distinctive for its frequent use of single-digit classic yeasts, creating varied expressions across its lineup through yeast character alone.