Folder 5 was a Japanese J-pop girl group formed in 2000 and associated with Avex Trax. The group blended J-pop, eurobeat, and hi-NRG into a bright, fast-moving sound built on catchy melodies, brisk rhythms, and an upbeat feel that fit the early-2000s pop landscape.
Anime fans know Folder 5 best for "Believe," the second opening theme for One Piece. That song gave the group a lasting place in anime music history and introduced their sound to listeners far beyond standard J-pop audiences. Across their brief but recognizable run, Folder 5 leaned into energy, momentum, and accessibility, with songs that echoed themes of friendship and adventure and matched the spirit of the series they helped define.
