One Piece: Heroines is a charming, beautifully animated side story that gives Nami and Robin the spotlight they deserve. It's not essential viewing for the One Piece narrative, and the story is simple, but it's a delightful watch for fans of the characters. The visual style alone makes it worth checking out, and the fact that it avoids the usual pirate action in favor of a fashion heist shows that One Piece can work outside its usual formula.