A voice, warm and heartbreaking, that of Brisseau himself, coils over black and white images. The tone was set very quickly: "To wake up is to be born again in the world of despair." 'On Sunday afternoon' is a film all at once clinical and theoretical on melancholy in the strong sense of the famous "black bile" of the Greeks whose author seems to want to make a complete turn, from his tragic dimension to his psychological dimension, even ending his film with a long quote from Freud's 'Mourning and Melancholia'.

A man stabbed to death is haunted by his memories and fantasies while dying alone.

Paris, Latin Quarter, May 1968. Images of barricades and police movements in the street. In his bedroom, on his bed, a young man indulges in daydreams that invade the whole space.