Kaori Nakaseko (中世古 香織,Nakaseko Kaori?) is a supporting character in the Hibike! Euphoniumseries and a member of the concert band. She is a third-year student who plays trumpet. In the Kitauji Concert Band, she is the trumpet section leader and the band accountant.
Kaori is a young girl, who wears the standard Kitauji High School uniform for third year students. She has short, bobbed, dark-brown hair, and matching brown-reddish eyes. Underneath her left eye is a beauty mark.
Kaori is considered to be popular and well liked among the members of the band, and has a soft tone in her voice and a gentle demeanor.
In the light novel, she is noted to look very alike to Reina.
Yuuko is shown to be obsessed with Kaori, even getting defensive about her playing the Crescent Moon Dance trumpet solo