One Piece OP 6~Brand New World by D-51. Rate it, 10/10 to be honest. One of the best OPs in One Piece I've heard since We Are and Kokoro no Chizu. Though this OP did have more spoilers from the Enies Lobby Arc than usuall, still one of the good OPs I seen in a while in One Piece. Plus, the fight scenes in it were <3