Very simply- It is a soulmate au, where people in the One Piece verse have marks that show they have a soulmate and if they have met them or not. ------------------------------------ Zoro had never cared for his mark. Well, he had never wanted, or even knew that he had one in the first place. Hiyori always cared for her mark. Well, she had gotten it quite late and had always relied on it for hope. What do you think would happen when soulmates, one keen, one reluctant, finally meet?