She is an exceptional swordswoman, being able to fight Chifusa and even hit her with a "Boob Slash" but unable to land a fatal hit due to the duel being interrupted.
Ouka is flat-chested and endured a harsh lifestyle until Muneyuki employed her, recognizing her incredible skill and not judging her because of her small breasts and consequent lack of social position. This kindness won Ouka's absolute loyalty for him and, probably, even her heart.
Title: "Boobie Kid" ( "Oppai Kozo" - おっぱい小僧 )
Title: "The First Breast Slash" ( "Hajimari no Chichi-giri - 始まりの乳斬り )
Title: "Munemori Village" ("Munemori no Sato" - 胸杜の里 )
Title: Title: "Breast Flow" ( "Chichi-nagare - 乳流れ )
Title: "Kaede's Chifusa-sama Breast Growth Record 02" ( "Kaede no Chifusa-sama chibusa no seicho kiroku 02" - 楓の乳房の成長記録 )
Title: "Forging Beautiful Breasts 02" ( "Binyu Tanzo 02" - 美乳鍛造 )