Pomme is a meek and mild French beautician whose life takes a fateful turn during a vacation to Normandy. She becomes the lover of middle-class literature-student François. The relationship sours when François takes her home to meet his parents, thanks in no small part to their differing social backgrounds.

The story is based around "spermulites", the alien inhabitants of a dying planet. The only way they can save their planet is by sucking the men of planet earth dry of sperm, kind of like horny vampires.