In the second season of BanG Dream!, Kasumi Toyama and her fellow Poppin'Party members have moved into their second year of high school. The new term brings new challenges including student council duties, cram school preparations, and part-time jobs, along with the fact that they are now in separate homerooms, which limits the time they can spend together. Looking back on their earlier carefree days, it feels like a distant memory, especially since they can barely find time to practice in Arisa Ichigaya's basement. Amid these issues, a mysterious girl suddenly appears, bringing the band back into the spotlight.
With the rising popularity of girl bands, other groups such as Afterglow, Pastel*Palettes, Roselia, and Hello, Happy World! begin to emerge. These bands, each made up of members with unique personalities, shine on stage with their performances. As Poppin'Party reconnects with the music scene and forms new friendships, the exhilarating rhythm of music plays once again!