The name comes from Jurakudai, the mansion built by Toyotomi Hideyoshi, the former regent. The brewery is located (Kamigyo Ward, Kyoto City) on the former site of Jurakudai, and as the area's name "Izumi" (Demizu) indicates, it is blessed with an abundance of high-quality groundwater, and has long been a region where water-related industries such as sake brewing and the tea ceremony have flourished. 
The brewery pumps up groundwater from the same aquifer as the "Ginmeisui" water that Sen no Rikyu is said to have used in his tea ceremony, and it still uses this water for brewing today. The words "Rakuchu Densho" embodi the spirit of our brewery, which has continued to protect the traditions of sake brewing in the Rakuchu area since its founding.