As Poppin'Party's fame grows, they stumble upon a poster advertising an event at the prestigious Nippon Budoukan. Determined to participate in the 'BanG Dream,' Kasumi Toyama and her bandmates set their sights on the illustrious stage to showcase their talents. In a parallel journey, RAISE A SUILEN, a rival band aspiring to revolutionize the music scene with their powerful sound, faces a dilemma without a guitarist. Despite numerous auditions, band leader CHU² deems the candidates unfit until a potential guitarist emerges who meets their exacting standards. BanG Dream! 3rd Season brings together various all-girl bands like Poppin'Party, Afterglow, Pastel*Palettes, Roselia, Hello Happy World!, and introduces RAISE A SUILEN, all striving to mesmerize Japanese fans with their sensational performances. With the BanG Dream contest on the horizon, these musicians are ready to enchant audiences with their soul-stirring melodies!