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Koinatsu | Demon Slayer Kimetsu No Yaiba
Koinatsu (鯉こい夏なつ Koinatsu?) is the oiran of the Tokito house.
Appearance
Koinatsu is a beautiful woman with fair skin and soft features. She has large but relaxed bronze-colored eyes, small eyebrows, and black hair.

She is dressed as an upper-class oiran/tayū having date-hyōgo Nihongami-style hair with multiple gold-colored hirauchi kanzashi hairpins supporting both the maegami and tabo sections of her hair. She wears an elaborate purple colored Susohiki/Hikizuri kimono (trailing skirt) with white polka dots as a pattern, with a peach colored haori with multiple golden clouds near the hem and cuffs, and a yellow juban under all that reached his ankles. She wears a pink-sakura-colored obi with a Fukura-suzume style fusubi knot exposed in the front and tall black three-legged sanmaiba/koma-geta or mitsu-ashi type shoes.

Personality
Koinatsu is a kind and gracious person, willingly thanking his kamuro/shinzō subordinates and rewarding them with candy for a job well done, as well as smiling at their happiness. Also, she worries deeply for their well-being when she had to leave to marry a potential suitor, especially regarding her failure to investigate the various disappearances that have plagued her district. She is also an observant woman, having known that Tanjiro was a boy as soon as he arrived at his establishment. She also seems to resent spreading rumors, berating her subordinates for discussing it with Tanjiro , presumably for misinformation.

Story
Koinatsu was an oiran from the Tokito house. Due to her status, she was one of the most revered people in all of Yoshiwara.

One day, apparently, a well-respected man decided to marry her, which she was extremely happy about. After this event, she left home and the Red Light District in general.
Powers
As an ordinary human, Koinatsu does not possess any additional powers or abilities.

Triviality
Koinatsu’s name contains the Kun’yomi reading of the kanji for “carp” (鯉 koi?) and “summer” (夏 natsu?).