In their first year of high school, Kumiko Oumae, and her classmates Hazuki and Sapphire go to see the brass band club.
Kumiko decides to join the club and continue playing the euphonium until she sees her middle school classmate Reina.
Anime Limited scored a pretty great property for UK release back in May 2016 when they announced they had the rights to the first season of Sound! Euphonium.
After remembering an incident that happened during a middle school brass band competition with Reina, she hesitates.