WS BanG Dream! Vol. 2 Booster Box (20 packs) - Rules of Play says:

Adorned with new outfits, all members of Poppin’ Party, Afterglow, Pastel*Palettes, Roselia, and Hello, Happy World! from BanG Dream! Girls Band Party! gather once again on the Weiß Schwarz stage! This set continues to feature even more of your favorite scenes from the mobile game! Cards in this booster can be constructed together with cards of previously released BanG Dream! Girls Band Party! Booster Pack (released in July 2018) and BanG Dream! Girls Band Party! MULTI LIVE Booster Pack (released in May 2019)! 8 cards in each booster pack.