The affiliate school of Maigahara Music College, Maigahara Senior High (also known as MaiMai), is renowned for housing the most talented musicians in the nation. As rumblings of an extra credit for a spectacular performance during the upcoming school festival circulate, Serina, a struggling student, believes the hearsay and resolves to establish a band. Serina collaborates with Aliciana, Nazuna, Nagi, and Naru, and together they indulge in enjoyable sleepovers, dynamic cosplay, and exhilarating performances that infuse their lives with happiness and positivity. However, can they deliver a show that will be deemed worthy of the fabled credit? Discover the adventure of this amiable and relatable all-girl band.