Vadim is an underground car park attendant, desperately in need of sun and company. He goes to the tanning salon where the blue light of the UV tints the blues with a sunny poetry. There he meets Léonore, his cabin neighbour, whose presence warms his heart. But the walls of the salon separate them: although he only knows her voice, Vadim would like to meet her in person.

Louison, 14 years old, observes the adult world with skepticism but envy. During a family weekend at the seaside, she begins to suspect Pierrick, her sister Emma's boyfriend, of Misaffection. Spying on the young couple, she gradually discovers the physical and psychological violence Emma is subjected to. She then tries to free her from Pierrick's grip, the seemingly perfect lover...​