“Underaged persons weren’t involved in scenes of explicit sex and nudity,” declares a title at the end of this Serbian drama. The disclaimer is necessary because at least half the film consists of what are obviously teenagers doing drugs and having sex (which includes graphic depictions of fellatio). An adolescent girl struggles with her father’s impending death by skipping school, drinking, snorting coke, and being treated like shit by her dumb and sadistic boyfriend, all of which she obsessively documents with her chintzy cell phone camera. (Director Maja Milos occasionally inserts these images, which eerily replicate Internet pornography.) That’s all the film is “about,” if it’s actually about anything. This is one of the ugliest pieces of Vice magazine-style exploitation I’ve ever seen. In Serbian with subtitles.