The members of Roselia who vowed to participate in FUTURE WORLD FES. After overcoming her various trials of becoming "us" with five people. And the season has reached autumn. Lisa grew up after writing the lyrics for "Promise". Yukina and Saya go out to hunt for autumn leaves and write a picture letter of determination to themselves in the future. Rinko tries to write a new song, driven by the desire to do something for Roselia. "The remaining quests are contests and tournaments ... FUTURE WORLD FES ...." Ako suddenly becomes anxious as she begins to think about her goals. What is the scenery seen by the five people ahead of FUTURE WORLD FES.