The sister of Shume and mother to Ryūō. A woman of the Hokuto clan, Ōka and her sister Shume gave birth to their respective sons on the same day. However, the priests of the Hokuto clan forbade the existence of two possible successors and choose to sacrifice expose both children to a pack of hungry wolves. Realizing that Shume was dying of a terminal illness and would not live to see her child grow, Ōka gave away her life in order to concede the successorship to Shume's son.After her death there was built a statue to honor her.
