Koinatsu

Koinatsu has fair skin, soft features, and black hair. Her bronze eyes are large yet relaxed, set beneath small brows.

She presents herself in the full splendor of a high-ranking courtesan. Her hair is arranged in an elaborate traditional style fixed with numerous gold hairpins, and she wears a trailing patterned kimono in purple with white dots beneath a peach haori decorated with golden clouds. A pink obi tied at the front and tall lacquered geta complete the ensemble.

Koinatsu is kind and openhanded, thanking her young assistants for their work with sweets and stories and beaming at their happiness. Her generosity is so excessive that even the establishment's mistress scolds her for spoiling everyone.

She worries deeply for those around her, especially over her inability to look into the disappearances troubling the district before she is set to leave for marriage. She dislikes idle gossip and chides her attendants for repeating rumors. Observant by nature, she recognized that the disguised Tanjiro was male from the moment he arrived.

As the highest-ranking courtesan of Yoshiwara, Koinatsu was among the most admired figures in the district. When Suma, one of Tengen Uzui's wives, was placed in the Tokito House to search for a demon, Koinatsu grew close to her and refused to believe she would simply abandon her duties when she vanished.

During the entertainment district arc, Koinatsu appears in a grand courtesan procession and later gifts the disguised Tanjiro candy for his diligence. On her final night before marriage, Tanjiro reveals his true identity, and she admits she had always known. Moments after he leaves, she is captured by Daki and absorbed into the demon's sash. Sensing the demon, Tanjiro returns and cuts the sash with Water Breathing, freeing her. It is presumed she escaped Yoshiwara safely during the evacuation Suma helped direct.