It's decided, on New Year's Eve organized by Brigitte, Oulage will seduce her and finally kiss her. He has everything planned, now or never, because Brigitte organized a costume party in her parents' house. He has everything planned - except the presence at the party of a band of particularly stubborn parasites: an Alsatian ex-girlfriend who hangs on, a manic-depressive police sergeant, a drug addict in need, a lovely Cuban in search of papers and many others who will do everything to prevent his business from seduction.