rikka koukou marching band e youkoso
立華高校マーチングバンドへようこそ 響け!ユーフォニアムシリーズ立華高校マーチングバンドへようこそ
The spin-off novel of the Hibike! Euphonium series titled Hibike! Euphonium Series Rikka Koukou Marching Band e Youkoso.
The story focuses on Rikka High School Marching Band. Sasaki Azusa, Kumiko's friend from middle school, is the main character of this novel. The story is set in about the same time as the main series but it is told from Rikka High School's perspective instead of Kitauji's.
This tag implicates hibike!_euphonium (learn more).