Oda Nobuna no Yabou Gaiden: Jakigan Ryuu Masamune

This side story centers on Bontenmaru, a daimyo from Oushu and the future Masamune Date. She serves as a companion and bodyguard to Louise Frois and is aligned with the Oda Clan. Bontenmaru has one blue and one red eye, and she wears an eyepatch to conceal what she believes to be a special power in her red eye. She exhibits traits of chuunibyou, a condition involving delusions typical of an eighth-grade mindset. Like Nobuna, she experiences a strained relationship with her mother.