A fascinating blend of a specific and real historical world with fantastical creatures! If a powerful monarch had the opportunity for eternal life, what choice would he make?

The French king, Louis XIV, has established the mighty Empire but has recently become aware of the fleeting nature of life after narrowly surviving an assassination attempt. Troubled by this realization, he learns by chance from his personal physician that the power of a mermaid can grant him immortality. He then orders the navy to capture a mermaid and bring her back to Versailles, where she is imprisoned. Meanwhile, his illegitimate daughter Marie, born from his beloved mistress, sent from a convent to the palace, where she is arranged to marry in order to settle a war debt. Unaware of the palace intrigues, Marie encounters the captive mermaid and befriends her, while also falling in love with Yves, the officer assigned to guard the mermaid. As their relationships grow deeper, Marie decides to defy her father, risking her life to rescue the mermaid, leading to a series of unstoppable events. Will Marie succeed in saving the mermaid, or will her plans be thwarted by the ambitious Louis XIV?