However, as shosho's real purpose was a marriage of convenience in order to get closer to rich Hitachi no suke, he exchanged Ukifune for her sister with the same mother, a real daughter of Hitachi no suke, when he came to know that Ukifune was a stepdaughter of Hitachi no suke.
しかし、少将にとっては裕福な常陸介と近づくための政略結婚であり、浮舟が常陸介の継娘と知った少将は実娘の異母妹に乗り換えてしまう。