The story is set in Uji, Kyoto and focuses on the Kitauji High School Music Club, whose concert band is steadily improving thanks to the newly appointed adviser's strict instruction.

Euphonium: The Movie – Our Promise: A Brand New Day, both taking place during Kumiko's second year of high school, premiered in 2018 and 2019 respectively.

A third season focused on Kumiko in her third year of high school aired in 2024, preceded by the theatrical OVA Ensemble Contest in 2023.

However, thanks to the newly appointed adviser's strict instruction, the students are steadily improving and building up their strength.

As they fight over who plays solos, some students give priority to studying and quit the club activities.

Euphonium is a 319-page novel written by Ayano Takeda, and features cover art drawn by Nikki Asada.

In 2016, a spin-off novel about Rikka High School Marching Band was released in two volumes on August 4 and September 6.

Two follow-up novel volumes focused on Kumiko's third and final year on high school were released in April and May 2019.

Two new animated films telling the events of Kumiko's second year at Kitauji High were scheduled for release in 2018.

[48] Tatsuya Ishihara returned to direct the OVA, with Taichi Ogawa serving as assistant director, Jukki Hanada writing the screenplay, Shoko Ikeda being posthumously credited for the character designs, and Akito Matsuda composing the music.

[51] Theatrical distributor Eleven Arts released Liz and the Blue Bird in theaters on November 9, 2018 in the United States.

[53][54] The English dub has a different voice cast, commissioned by VSI Los Angeles, compared to Liz and the Blue Bird, though Sarah Anne Williams, Ryan Bartley and Megan Harvey reprised their roles as Natsuki, Satomi and Yuko, respectively.

[56] An English dub of the first season was released on Blu-ray by Crunchyroll on December 17, 2024 and retains much of the cast of Our Promise: A Brand New Day.

[59] The series has often been criticized by Western viewers for perceived queerbaiting with regards to the relationship between lead characters Kumiko Oumae and Reina Kousaka.

[60][61][62] Crunchyroll's Twitter account acknowledged the pairing by tweeting a screenshot from the show,[63][64] which was still airing and being officially simulcast by the service at the time, in the wake of the legalization of same-sex marriage in the United States.

In 2015, Nio Nakatani praised the anime for its perceived yuri aspects, which she said had inspired her while she was drawing Bloom Into You.