Azifafello asked:
Yeah yeah, Folder 5 is the band, Believe - the song. It was used as the second opening song in the anime One Piece. End of facts, now for the laughs 
The choreography is quite funny (as in most japanese videos), but I espiecially loved the close-ups in the end, with the huge disco ball in the background. And I really believe none of the girls has straight teeth 
Becoming quite a hobby of mine - searching for those lame and/or funny japanese (and other - that guy from Kazachstan! 
) videos.
Have fun watching.