Yukina Minato gathers members intertwined with different thoughts to form a band and participate at the Future World Fes. This is the story of their "promise" from their formation to the challenge of the music festival.
Unfortunately the movie BanG Dream! Episode of Roselia I: Promise is not yet available on HBO Max.
| Sound | Yasushi Inomata | Sound Effects |
| Production | Takaaki Kidani | Executive Producer |
| Directing | Atsushi Mimura | Director |
| Writing | Kohdai Kakimoto | Screenplay |
| Directing | Kohdai Kakimoto | Director |
| Editing | Tomomi Umetsu | Editor |
| Camera | Mari Inoue | Director of Photography |
| Visual Effects | Kazuyuki Ueda | Character Designer |
| Visual Effects | Motomu Endo | CGI Director |
| Visual Effects | Junko Kitagawa | Color Designer |
| Art | Hiroki Makino | Art Direction |
| Sound | Satoki Iida | Sound Director |
| Sound | Noriyasu Agematsu | Music Producer |
| Sound | Junpei Fujita | Music Producer |
| Writing | Kou Nakamura | Original Story |
| Writing | Yuniko Ayana | Series Composition |
