Sound! Euphonium: Secret Story of the Kitauji High School Concert Band

Sound! Euphonium: Secret Story of the Kitauji High School Concert Band (響け! ユーフォニアム　北宇治高校吹奏楽部のヒミツの話) is the fourth novel of the Hibike! Euphonium series. It was released on May 25, 2015.

Synopsis
This volume is the collection of a few short stories. Some take place during or between the event of volume 1,2 and 3 and some take place after the end of volume 3.

Major Events

 * Yuuko gets elected to be next band's president while Natsuki gets elected to be next band's vice-president.