A mysterious mermaid washed ashore in the Seine who hypnotizes men with her singing, often fatally. She possesses a tail wound, needs to return to the ocean quickly, and carries a dark past of avenging her mother's death. Despite her dangerous nature, she develops genuine feelings for Gaspard and ultimately escapes to the sea with her tears of pearls.
Their relationship develops from rescue and mutual fascination into an emotionally serious romance.
Gaspard shelters Lula, protects her from Milena, and kisses her underwater after diving with her in the shark tank.
Rossy moves from comic curiosity to practical support for Lula.
Rossy visits Lula, mistakes her for Gaspard's girlfriend, tells her about the Flowerburger, and later helps her escape.
Milena becomes Lula's principal human antagonist after Victor's death.
Milena investigates Victor's death, identifies the mermaid's biological traces, captures Lula, and tries to prevent further victims.
Victor becomes the first directly shown fatal victim connected to Lula's song.
Victor examines the unconscious Lula, is hypnotized by her singing, and later dies suddenly.
Lula is treated as an unknown biological specimen during the hospital investigation.
The biologist helps Milena collect samples from Lula while she is being held at the hospital.
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