The fourth and penultimate film in Truffaut's semi-autobiographical series about Antoine Doinel depicts our hero in the early years of marriage. Antoine and Christine become the proud parents of a son, but Antoine soon tires of domesticity and is lured into a disastrous affair with a Japanese girl

Some time after "Baisers Vols", Antoine Doinel (Jean-Pierre Laud) and Christine Darbon (Claude Jade) are married and Antoine works dying flowers, and Christine is pregnant and gives private classes of violin. When Christine is near to have a baby, Antoine decides to find a new job, and he succeeds due to a misunderstanding of his employer. In a business meeting, he meets the Japanese Kyoko (Mademoiselle Hiroko) and they have an affair. When Christine accidentally discovers that Antoine has a lover, they separate. But later they miss each other and realize that they do love each other. Written by Claudio Carvalho, Rio de Janeiro, Brazil