Based on a successful cabaret theater play, Come to my Place, I'm Living with my Girlfriend features Guy (Michel Blanc) as a carefree and morally challenged gas station attendant suddenly in need of a place to live. It seems his boss caught him trying to cheat his customers, and Guy was thrown out on his ear. He saves the day for himself by wheedling his way into the good graces of two friends, Daniel (Bernard Girardeau) and Francoise (Therese Liotard), a young couple who are easy-going and willing to share their apartment with him "for a few days." The "few days" turn into week after week, as Guy connives to stretch out his good fortune as far as he can. Acting as though his welcome will never wear out, he further strains the relationship with Francoise and Daniel by entertaining a series of girlfriends - for whom he has an undying passion. His antics begin to short-circuit the happy relationship that Daniel and Francoise have always enjoyed, and sooner or later, the problem of "Guy" will have to be resolved before fuses are blown for good.