Apollon and Apolline are in a perfect love. One day, Apolline suddenly changes her hairstyle. In response to this change, the balance in the couple wavers : Apollon develops an obsession with Apolline's hair.

Guillaume lives alone in a tower apartment. He spends his days dreaming and reinventing his life until Abel and Jeanne, a young couple, move above his flat. Guillaume starts to project his own existence on the couple and begins a fantasized love triangle with them.