Koinatsu

Koinatsu is a supporting character of Demon Slayer: Kimetsu no Yaiba. She is the Oiran of the Tokito House.

Appearance
Koinatsu is a young woman with fair-skin and soft features. She has large but relaxed bronze-colored eyes and small eyebrows with black hair.

She is dressed as an upper classed oiran/tayū having date-hyōgo Nihongami-styled hair with multiple gold-colored hirauchi kanzashi hairpins supporting both the maegami and tabo sections of her hair. She wore an elaborate Susohiki/Hikizuri (trailing skirt) kimono being purple with white polka-dots as its pattern, with a peach-colored haori with multiple golden clouds near the hem and cuffs, and a yellow juban under everything reaching her ankles. She has a pink-sakura colored obi with a Fukura-suzume styled-musubi knot exposed at the front at the front and tall, black three-legged sanmaiba/koma-geta or mitsu-ashi shoes.

Personality
Koinatsu is a kind and gracious woman, readily thanking her kamuro/shinzō subordinates and awarding them with candy for a job well done, as well as smiling at their happiness. In addition, she worries deeply for their well-being when she was to leave to marry a prospective suitor, especially in regards to her inability to investigate the various disappearances that plagued her district. She is also an observant woman, having known that Tanjiro Kamado was a boy from the moment he arrived at her establishment. She also seemed to dislike the spreading of rumors, chiding her subordinates for discussing them with Tanjiro, presumably for misinformation.

History
Koinatsu was an Oiran in the Tokito House, and the highest ranking courtesan in Yoshiwara District. Due to her status, she was one of the most revered people in all of Yoshiwara.

Suma, a wife of the Sound Hashira Tengen Uzui, was tasked with being recruited into the Tokito House to observe and search for a supposed demon in Yoshiwara. Koinatsu presumably got to know Suma and befriended her, as she believed she wouldn't run away from her duties as an oiran when Suma suddenly disappeared.

Entertainment District Arc
Koinatsu first appears during her Oiran Dochu, a long, complex procession performed on her way to her next client. She was spotted by Tengen, Zenitsu Agatsuma, and Inosuke Hashibira, with Tengen recognizing her. Zenitsu, annoyed from knowing that Tengen has three wives, asks if Koinatsu is married to him, claiming it isn't fair he has multiple wives as pretty as she is, leading Tengen to deny his statement and punch him in the face.

At the Tokito House, she overhears a conversation about Suma's disappearance between her subordinates and the recently joined "Sumiko", in actuality a disguised Tanjiro. She chides them for spreading rumors about her leaving the district out of love, claiming it is unknown what really happened. Koinatsu sees Tanjiro's hard work and gifts him with candies as thanks.

When he tries to push the topic about Suma further, she becomes alarmed at such a touchy subject, asking why he wants to know. Tanjiro tries to lie but his sincere nature clashes with his dishonesty, eventually saying that Suma is his older sister, and that he is here to look for her. Koinatsu, relieved that "Sumiko" isn't pushing the subject matter out of gossip but concern, agrees that Suma did not abandon her role as an oiran from loving someone, though she adds that her diary was found and had hints of her leaving inside; Tanjiro hears this and believes the diary is forged and Suma is missing.

She is later asked by her young assistants to read them books. Before doing so, Koinatsu gives them special kanzashi hairpins as a gift, even though they were meant for her. That night, alone in her room after sending them away for dinner, she is suddenly met by Tanjiro, who has shed his disguise and is equipped with his Demon Slayer uniform and Nichirin sword. When Tanjiro apologizes for hiding himself, Koinatsu notes that she knew he was a male the entire time.

She hears as Tanjiro plans to rescue everyone who has gone missing, causing Koinatsu to be relieved. She mentions that this is her final night in Yoshiwara as she is getting married, and that she had been worrying for those who disappeared. Grateful for everything he has done, Koinatsu thanks "Sumi" and tells him not to disappear as well. Though he had just left, Koinatsu hears something behind her, believing Tanjiro had forgotten something. She turns around to see who she thinks is Warabihime of the Kyogoku House, Daki, Upper Six of the Twelve Kizuki. Daki tells her she has not forgotten it was her final night as well, as she plans to devour her. Koinatsu is paralyzed with fear and does nothing as her body is absorbed by Daki's obi.

Tanjiro, having sensed that a demon is in the Tokito House, returns to Koinatsu's room to see her being absorbed by Daki. He battles the Upper Rank and is able to sever an obi with his Water Breathing, the one Koinatsu was absorbed into and freeing the Oiran.

Although she is not seen again afterwards, it is presumed that she would have fled Yoshiwara safely, as her friend Suma had been directing the evacuation of everyone in the area, when the battle between the Demon Slayers and the Upper Six siblings began to become more intense.

Abilities
As an ordinary human, Koinatsu doesn't possess any additional powers or abilities.

Trivia

 * Koinatsu's name contains the Kun'yomi/reading for both the kanji for "carp" and "summer".

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Койнацу 鯉夏 鯉夏