The narrative spans several formative years across two distinct chapters:
Chapter 1: The Awakening
Adèle attempts a conventional romance with classmate Thomas, but feels detached and unfulfilled. After locking eyes with the blue-haired Emma on a Lille street, Adèle has erotic dreams about her. She explores a local gay bar, encounters Emma, and the two strike up a deep connection. Despite homophobic bullying at school, Adèle falls completely in love with Emma, culminating in an intense sexual relationship.
Chapter 2: Domesticity and Rupture
Years later, Adèle and Emma live together. Adèle works as a devoted nursery school teacher, while Emma builds an art career. Cultural fissures widen: at a party hosted for Emma's art friends, Adèle spends the night cooking and serving food like domestic help, alienated by the pretentious intellectual discourse. As Emma begins spending more time with an art gallerist named Lise, Adèle feels increasingly lonely and neglected. In an act of emotional desperation, Adèle has a brief sexual encounter with a male colleague. When Emma discovers the infidelity, an explosive, physically aggressive confrontation erupts in their apartment, and Emma ruthlessly throws Adèle out on the street.
The Café Reunion and The Gallery Ending
Years later, Adèle invites Emma to meet at a café. Still deeply in love, Adèle weeps and propositions Emma, who admits she still harbors infinite tenderness and desire for Adèle, but explains she has built a stable life, family, and home with Lise and cannot return. Later, Adèle attends Emma’s solo art gallery exhibition wearing a blue dress. She sees portraits of herself on the walls alongside paintings of Emma's new family. Samir, an empathetic acquaintance from the past, tries to talk with her, but Adèle quietly slips out of the gallery and walks briskly down the street alone, finally letting Emma go and stepping into her own independent future.