A story is about young teenage girl, with sister and brothers, a pleasant uncle and aunt, an annoying nanny, a young boy interested in kissing her, a close relationship with the imaginary addressee of her daily diary and her parents' disintegrating marriage - all this in a rented house in a summer resort.

Nathalie Baye
as Lena

Jean-Pierre Bacri
as Léon

Zabou Breitman
as Bella

Richard Berry
as Michel

Vincent Lindon
as Jean-Claude

Valeria Bruni Tedeschi
as Odette

Julie Bataille
as Frédérique

Didier Bénureau
as Ruffier

Candice Lefranc
as Sophie

Alexis Derlon
as Daniel