Mizore Yoroizuka plays the oboe, and Nozomi Kasaki plays the flute in Kita Uji High School’s concert band. Mizore is shy and soft-spoken, while her best friend, Nozomi, is outgoing. The two girls grow closer as they practice for their last duet before graduating, a piece called “Liz and the Blue Bird.” However, the impending separation may be more than their friendship can handle. Intersperse...