Kasumi and other members of Poppin'Party, who are in their second year of high school, are very busy whether they are in the student union or helping at home, whether they are tutoring or working part-time. The time they spend together is gradually decreasing, and it is difficult to gather in the warehouse as a base. A girl appears next to them. A new encounter. Unchanging fetters. Afterglow, Pastel＊Palettes, Roselia, Hello, HappyWorld! also appear one after another, and the band members with rich personalities are intoxicated on the shining and exciting stage! "I want to hold a Live with everyone again", the musical dream starts now!