She was a niece-in-law of Kasuga no tsubone, who dominated O-oku (inner halls of Edo Castle where the wife of the Shogun and her servants reside) in the same period, and served as an assistant asked by Kasuga no tsubone.
同時期に大奥で権勢を振るった春日局の義理の姪にあたり、局に請われてその補佐役を務めた。