The brewery was founded in 1923 (Taisho 12) in what is now Kitamachi, Toyota City, Aichi Prefecture. This area is blessed with abundant water, where digging a well brings up pure subsoil water from the Yahagi River. With permission from the local Koromo Shrine, the brewery received the name "Kaō (Nioizakura)" from a poem monument on the shrine grounds and began producing Seishu Kaō (Nioizakura). Under the name Seishu Toyota Masamune, they also produce a variety of sake including daiginjo, junmai, and honjozo. These sake products are especially beloved by the local community and have earned broad support from fans across the region.