Rhapsody in Flu (かぜひきラプソディー Kaze Hiki Rapusodī) is the eighth episode of the second season of the Hibike! Euphonium anime series. It was broadcasted on November 23, 2016.
Kumiko reflects on her sister, who was her original inspiration for wanting to play music, and the way her sister quit band to focus on college exams. While the other band members are reassured by Asuka saying she won't cause them any trouble, Kumiko asks if she really won't quit, and Asuka invites her to do homework together. Asuka shows up to club less and less often. One day Kumiko catches a cold and goes home early, meeting Aoi along the way. They talk about Asuka, and Aoi is surprised that Asuka has such messy circumstances, which angers Kumiko. At home sick, Kumiko dreams about her early days playing the euphonium, and wakes up to find Reina visiting her. The two of them listen to a CD by a famous euphonist together, but are interrupted by Mamiko, who tells them to stop; Kumiko lashes out at Mamiko, leading to an argument. Mamiko meets Shuuichi later, who tells her how Kumiko wanted her sister to hear her play.