Feckless aspiring architect Stéphane leaves his pregnant girlfriend Natalia for theater designer Sabine; Sabine in turn vainly attempts to overcome her violent obsession with an actor in her theater company. A game of emotional chutes and ladders ensues.
Stéphane meets his ex-girlfriend Natalia at a party, where she came with her current live-in boyfriend Richard (or he could already be her husband). She is drunk and flirty. Stéphane and Natalia end up making out on the rooftop of the building and in the bathroom (1:08:10). It doesn't proceed to sex because she comes to her senses.