A side story of Oda Nobuna no Yabou which focuses on Bontenmaru, the Daimyo of Oushu and the future Masamune Date. She is a companion and bodyguard of Louise Frois and an ally of the Oda Clan. Possessing heterochromia, she also has a case of chuunibyou (8th grader adolescent delusions), believing her red eye has special powers which is hidden under an eyepatch. Like Nobuna, she also has an estranged relationship with her mother.