Poppin'Party is faced with their toughest adversary yet - the prestigious Budokan's BanG Dream! Girls Band challenge - in the third season of BanG Dream! They must surpass fierce competitors, including RAISE A SUILEN, a powerful new ensemble led by Chiyu seeking retribution from Roselia and Poppin'Party, especially Yukina, who deprived Chiyu of a producer role. Chiyu's innate musicality and resources elevate the contest to new heights, requiring Poppin'Party to produce their own music video and match the pace. They must come out on top if they desire to secure a place on the center stage. The stakes are high, and Poppin'Party must emerge Victorious.