Delphine is 25 years old. She has a passion for swimming and is preparing her lifeguard diploma with great enthusiasm and diligence. She loves Laurent and lives with him at his father's house in the Drôme Provençale. During a competition, she meets David and falls in love with him. He obtains a transfer to Montélimar, where Delphine lives, to be closer to her. But she is pregnant by Laurent.