It is the spring of their first year in high school. Oumae Kumiko, who was in a brass band in middle school, goes to check out the brass band club together with her classmates, Katou Hazuki and Kawashima Sapphire. There, Kumiko happens to run into her former classmate, Kousaka Reina. Although Hazuki and Sapphire are dead set on joining the brass band club, Kumiko doesn't want…