She was said to be one of the ladies-in-waiting in attendance on Empress Shoshi (also read as Masako) and to have been called Omotomaru at first, but there are also theories that contradict this assertion.
はじめ御許丸（おもとまる）と呼ばれた太皇太后宮昌子内親王付きの女房だったらしいが、それを否定する論もある。