Awaiting new club leader Kumiko is the Ensemble Contest, and the school's preliminary competition to determine the representative team to participate. Kumiko tries her best to make it to the preliminaries without incident, but the concert band club is so large that there seems to be no end to the problems. And as club leader, she finds herself busy consulting on all sorts of matters. While the other members are deciding on their teams, Kumiko herself hasn't even decided which she will join...

In their last year of high school, two girls in the brass band club perform a song inspired by a fairy tale that parallels their friendship.

Miss Kobayashi, Tohru, Kanna, and Iruru's peaceful lives are shattered when Kanna's father, Kimun Kamui, leader of the Chaos Forces, arrives and forces her to return to the Dragon World to fix a past mistake. With a war brewing between Chaos and Harmony, Kanna must find a way to unite the two worlds but is torn between her loyalty to her friends and her father's demands. Miss Kobayashi, however, refuses to let her go and tries to mend Kanna and Kamui's broken bond. As dragons clash, Iruru uncovers a hidden force manipulating the war. Can they stop the war before it consumes both worlds?

The music isn’t over yet! “Sound! Euphonium: The Final Movie, Part 1” is coming in 2026!

The second part of Sound! Euphonium: The Final Movie.