After spending the night together with her idol, Sinclair, Léa hopes to see him again soon. She still finds it difficult to quite grasp what has happened to her when a trivial accident brutally puts an end to her dream.

On the eve of the summer vacations, Marc (16 years old) only dreams of one thing: seduce Sonia. Tonight, he has decided to confess his love for her. But while he performs a balancing act to impress her, he is taken by a dizzy spell and is victim of a fainting spell. He is rushed to the hospital and the doctors discover that he has leukemia. A race against time begins: the disease and Sonia's love become Marc's two challenges.