Hibike! Euphonium Kitauji High School's Concert Band Diary (響け! ユーフォニアム 北宇治高校の吹奏楽部日誌Hibike Euphonium Kita Uji kōkō no suisōgaku-bu nisshi, lit. Sound! Euphonium Kitauji High School's Concert Band Diary) was released on October 6, 2016 after the main Hibike! Euphonium series and its spin-off novels. The stories in this book focuses on both Kitauji High School and Rikka High School concert band. It also includes the special interview with Ayano Takeda, the author of the novel.