Koku-u

Koku-u (黒羽コクウ, Kokuu?) is an lady-in-waiting in the Jade Pavilion and a minor character in The Apothecary Diaries. Joined Gyokuyou from her home town as a servant after the Crown Prince was born. She aids in cleaning and cooking in the palace. The middle of three nearly identical sisters, Koku-u wears a black ribbon in her hair to differentiate her from Haku-u (white ribbon) and Seki-u (red ribbon).