It will cover the events of the second season
During the Hibike! Euphonium 2 Special Talk Event 1-2-nensei Godo! It was revealed the name and story for the second film based on the anime of Hibike! Euphonium, which will be called “Gekijouban Hibike! Euphonium: Todoketai Melody”.
A teaser was also presented which you can see bellow:
Tatsuya Ishihara (Hibike! Euphonium) is directing the movie.
The Movie will premier on September 30.
Via: Crunchyroll Latin America (Spanish)