A young man, Jimmy known as “Kisss”, wanders on the bridges of Paris, carrying a sign “for rent”: he offers his services as a companion, in exchange for a can of tin per hour. He meets a young woman, Renée, who then takes him into her home. Both are maintained by Renée's sister, the naive Jacqueline. The latter works as a secretary for a businessman who pursues her with his attentions.