Hitori Gotou, also known as Bocchi, longs to make friends and perform in a band. But she struggles with shyness and isolation, spending most of her time practicing the guitar, hoping for a chance to showcase her talents. One day, fate steps in as she meets Nijika Ijichi, a confident drummer who invites her to join Kessoku Band. But Ryou Yamada, the band's sole remaining member, appears distant at first. Despite a lackluster debut performance, the girls bond over music and one another. With the return of Kita, the band gains momentum and they tirelessly work to improve their skills. As their high school days come to a close, the stage becomes a sanctuary where Bocchi and her bandmates pour their hearts and souls into their music, creating something beautiful together.