Fleur, a shy young Parisian in Marseilles, meets Vénus, a flamboyant but lost Russian girl. They have nothing in common, save for their wish to meet the ideal boy.

Yakuza Naoki Sando discovers his daughter Hiroko in bed with his adopted son Kohji. Three years later, Kohji is working the streets as a hustler, still yearning for a way to earn his estranged father's approval to continue his borderline incestuous relationship. Hiroko sees a way back to her brother's arms when Sando's shady colleague Marc Tanner absconds to Canada with gambling funds destined for the big boss. Presumably with her father's permission, she calls Kohji and tells him to hurry to Montréal, recover the money and kill Tanner.

Paris, 1830. Valentin loses himself in alcohol, gambling and women. He does not believe in life and especially not in love. His uncle Van Buck believes only in the virtues of money and trade. Everything separates them until the day when Van Buck, to improve his public image, wants to make Valentin marry the young and impoverished Baroness Cécile. Valentin, who has absolutely no desire to get married, bets that he can easily seduce her in 24 hours and thus prove that she, like all the others, is not worth loving... But Cécile, who believes in true love, will prove much more difficult to woo than envisaged and Valentin will have to use all possible stratagems to try and win his bet. The game of cat and mouse starts... But who is the cat?