The collaboration has started 3-4 days ago. You should try it out before 24th of June. BanG Dream! is a franchise that consists of all-girls band featuring Poppin' Party along with the other bands, Afterglow, Pastel Palettes, Roselia, and Hello, Happy World. Poppin' Party and Roselia have their voice actresses who are known to play their instruments during live concerts. BanG Dream! Girls Band Party! is a rhythm game for iOS and Android. It also features multiple original stories for individual bands.