This is an interesting film about two teenage French lovers, both from troubled homes. The boy has the typical, at times overbearing and at other times inattentive, divorced father. The girls' home-life is much worse. Her father gains custody of her just so he can commit her to an institution. Her mother is well-meaning, but has troubles of her own, being mixed up with Scientology and a violence-prone Muslim boyfriend. After the girl escapes from the institution, the pair rendezvous at a party/bonfire at an abandoned house (an interesting scene that takes up nearly the whole middle third of the movie); they then go on the lam together.
America/Hollywood has made many (really way too many) movies about teens, most of which are typically saccharine and very cliché-ridden. The French, on the other hand, often make movies with teens (especially teen girls) who are worldly and sophisticated beyond their years and typically involved in sexual affairs with angst-filled middle-age men. This movie really avoids either of these tedious moulds, and given that, and the general lack of over-the-top drama, this one of the more realistic teen movies I've seen, either from France OR America. Given the music, I think it might have been set sometime before 1994 (maybe the 70's) and could have been a personal story for the filmmakers.
French beauty Virginie Ledoyen is, of course, much more attractive than your typical alienated teenage girl, even given a startling scene where she gives herself a very bad haircut on-screen while her emotionally disturbed character is wandering around the house party (to the tune of Janis Joplin's rendition of "Me and Bobbi McGee"). Her bad haircut and surprisingly very decent acting almost make her seem like a normal troubled teen girl for awhile (at least, until she takes all her clothes off at the end and reminds us we're in the presence of rare, unattainable beauty--but then I guess that's a stupid thing to complain about). I know less about the young actor playing the boy, but he's very decent too. The adults in the movie are believably ineffectual while the teens and teen extras are believably inarticulate (it's nice not to hear the kind of precocious trendy teen-speak that American movies are always lousy with).
I've seen a lot of French movies about teens recently (or, at least, ridiculous sexy French teen girls) like "Noce Blanche" and "Elisa" (with Vanessa Paradis and Gerard Depardieu), "La Boum" (with a young Sophie Marceau), and "L'Ennui" (with Sophie Guillemin). This may or may not be the best, but it is certainly the most realistic.