Sound! Euphonium, the Movie -Welcome to Kitauji High School Concert Band-

――I’m so frustrated I could just die.

Kumiko Oumae has never been able to forget the tears in Reina Kousaka’s eyes at the band contest when they were in their third year of junior high.
Now in high school, Kumiko is invited to join the school’s brass band by Hazuki Katou and Sapphire Kawashima, but the band’s current performance level definitely isn’t going to earn any applause…

But when the band’s new advisor, Noboru Taki, arrives, everything starts to change.
Though some rebel against Mr. Taki’s strict guidance, little by little, the students in the band start to improve their playing, and their confidence rises along with it.
Kumiko can also feel the distance between her and Reina beginning to close.

With the Sunrise Festival is coming up soon, Mr. Taki announces auditions to choose the band members for the contest.
Having surmounted many trials, the brass band aims for the Kyoto prefectural finals…