Kasamori Osen was a waitress at the Kagiya teashop near Kasamori Inari Shrine in Yanaka, a neighborhood of Edo; the shop was owned by her father, Kagiya Gohei. Osen was made famous as a local beauty by a number of ukiyo-e artists of the time, Suzuki Harunobu first among them, who took her as the subject of their prints. Along with Ofuji of the Hon'yanagi toothpick shop and Oyoshi of the Tsutaya teahouse, she was apparently categorized as one of 'The Three Beauties' of the time.