Pierre, an anxious young man, lives with his mother in a little house. Each day, each week has the same routine, which drives Pierre insane to the point where he wants to mutilate himself. But he cannot bring himself to do so. His only joy is his relationship with a girl from his gym club. When his mother is out one evening, they decide to spend the night together. But his frustrations get the better of him and he kills the girl. As though nothing has happened, he returns to the drag of his daily life the next morning.