BanG Dream! Episode of Roselia II: Song I am.

The members of Roselia have pledged to perform at FUTURE WORLD FES after enduring many challenges. As autumn arrives, Lisa grows through writing the lyrics for "Promise." Inspired by the changing leaves, Yukina and Sayo send a picture letter expressing their determination to their future selves. Rinko begins composing a new song to contribute to Roselia, while Ako feels uneasy as they consider the remaining goals: the contest, the tournament, and FUTURE WORLD FES. The group contemplates what awaits them beyond the festival.