Ototachibana-hime

The daughter of Oshiyama no Sukune a powerful noble from the Ise Province. She wears mens clothing and styles her hair in a masculine fashion. Headstrong and proud of her lineage she harbors a competitive spirit against the central royal family including Yamato Takeru Prince Ousu. Upon his visit to Ise she challenges him to a horse race at their first meeting but loses. From then on she develops feelings for him. mangapedia.com