Mio is a young girl who lived in an abandoned temple with orphans who lost their parents in the war. She is kind and caring as she tends to put others in priority instead of herself. Spoiler In order to provide food for the children, she serves both of the warring clans during night time as a prostitute. She is not ashamed of her job as long as she can earn from it. However, she does have a tendency to refer to herself as "Filthy".
She is Hyakkimaru’s love interest. SpoilerShe was killed by troops sent by the order of Hyakkimaru's father, Kagemitsu Daigo after suspicions of her being an enemy's spy.