Kurosu Riri, disillusioned with her mundane school routine, embarks on a musical journey by teaming up with Ayata and Jin to start a band. However, their harmonious aspirations hinge on reuniting with estranged member Ruki Sugisaki, who is at odds with Ayata. Can Riri mend the rift and unite the group before it crumbles, fulfilling her musical dream?