The narrative focuses on five Japanese high school students who are too young to be considered adults, yet no longer view themselves as children. Wakana Sakai previously took music lessons, but she quit after her mother passed away. Konatsu Miyamoto is an optimistic girl who enjoys singing and spends her after-school hours in the vocal music club. Sawa Okita is an energetic member of the archery club who aspires to become a horse rider. Daichi Tanaka is a chronically tardy member of the badminton team who lives with his sister, a college student. "Wiin" recently transferred into Wakana's class following twelve years abroad in Austria. Music unites Wakana, Konatsu, Sawa, and the others into an ensemble during their final summer of high school.