Tokugawa Sen

Yagyū Muneakira 's childhood friend and the eldest daughter of the Tokugawa Shogunate. She seems to have feelings for Muneakira, and acts very much like a tsundere towards him. She is a self-proclaimed spoiled princess and always seeks to get her way regarding any decision she wants to make. She gets extremely jealous of any girl who tries to get close to Muneakira, and generally acts upon this jealousy by flying into a rage, like when Jūbei Yagyū kissed him in front of her and she later had him wear a full oni helmet so he could "reflect" on the kiss he shared with Yukimura Sanada.