Describe the predicament between Genji and Oborozukiyo.

Genji and Oborozukiyo meet at the festival of the Cherry Blossoms. He sleeps with Oborozukiyo but does not know who she is. He believes that she is one of the daughters of Kokiden. Genji travels to the Kokiden house in order to find out who this woman is. He hears the voice of Oborozukiyo and recognizes it.