Arsel de Leahr knew her fate as soon as she realized she was inside the world of a novel. To prevent her eventual tragic death, she turns to the secret pirate of the empire, Duke Gael von Zenat. Arsel proposes marriage to him in exchange for access to her family's valuable sea territories, and he gladly agrees. But even though Arsel thinks their union is a mere formality, Duke Zenat falls deeper in love with her. Can their marriage stay afloat? Or is it doomed to sink to the bottom of the ocean?