The young vicar Victor and Sister Marie Ernestine, caught while they were making love, are defrocked by their cardinal. In front of their newly rented flat, they will come upon two couples who practice swinging.

Mattéo, a young survivor of an unknown apocalypse, roams the empty streets of Paris. After taking refuge in an abandoned university, he meets other survivors from a world that has refused to die. The confrontation between the old and the new soon becomes a recipe for a horrific disaster.