Manon, an introverted 16-year-old girl, is forced to live with her unbearable grandmother Yvonne, an ex-feminist activist who can no longer live alone.
The situation becomes more complicated when Yvonne, confused, starts to take Manon for her daughter.
Manon enters Yvonne's delusions and plays the role of her mother, whom she has hardly known.
This is an opportunity for her to discover the true history of the women in her family and to learn, in turn, to become one.