A Parisian couple decides to sell an unsanitary basement in their building. A very ordinary, nondescript man, Mr. Fonzic, shows up to buy it. Nothing unusual there, until the man moves into the cellar and makes it his permanent residence. The couple tries desperately to cancel the sale but to no avail. Worse, Mr. Fonzic becomes a threat to their family as he befriends their teenage daughter on whom he seems to exert a perverted influence.
Raoul is a 20 years old student in Paris. Girls are not interested in him, though he is good-looking. He wonders why. Raoul does not look for a great passion, he only wants to be kissed. We will follow his love tribulations.