A royal court erupts when the eldest mermaid princess, Rosalie, is accused of being a 'mudblood' by a man named Xavier, who also denies their child. The King condemns Rosalie, ordering her scales stripped and her body cast into the Abyssal Hell. Her mother, Empress Helen, confesses her role in a deception, leading to her own imprisonment. In her agony, Rosalie hears a mysterious voice calling her back. She awakens reborn to the very moment she was choosing to marry Xavier, ready to change her fate.