Kasumi Toyama and the members of Poppin'Party, their high school band, are now in their second year, but the new school year brings with it a new set of responsibilities, including student council duties, cram school, and part-time jobs, to name a few. Furthermore, they have been segregated into various classrooms, which has resulted in a reduction in their free time together. When their members are too preoccupied to even convene in Arisa Ichigaya's basement for practice sessions, their happy times together seem like an unattainable ideal. As the band mulls over the situation, an unexpected female appears out of nowhere, unwittingly bringing them back into the spotlight. Afterglow, Pastel*Palettes, Roselia, and Hello, Happy World! are just a few of the rising girl bands. begin to make their appearance as well