Sukeroku's biological daughter, who was taken in and raised by the Eighth Generation Yakumo Yuurakutei. She harbors an intense hatred for Yakumo, who she believes is responsible for the murder of her father.
Sukeroku and Miyokichi, her mother, moved to the countryside to give birth to her. Miyokichi skipped town in the aftermath, leaving Sukeroku to raise her alone. In this time, she grew to adore her father's rakugo, and learn how to perform in his style to entertain customers at a local soba shop. Following her parents' tragic deaths, she was taken in by Kikuhiko, who actively discouraged her from performing rakugo whenever he could, though she continued to practice in secret.

Ten years after meeting Yotarou, she falls pregnant.

A few years after she gives birth to her son, Shinnosuke, she falls in love with and marries Yotarou. When Shinnosuke is 7, she falls pregnant again with a daughter she names Koyuki. Before Koyuki is born, Konatsu successfully convinces Yakumo to become his second apprentice, but he dies moments later. Sixteen years after his death, she is able to become a rakugo performer under the name "Kousukeroku."

She refuses to talk about the identity of Shinnosuke's biological father, and while Yotarou believes it is his former yakuza boss, Higuchi theorizes much later that it may be the Eighth Generation Yakumo himself. She does not confirm or deny this idea.