While doing a film project at a private school, internet-video obsessed teenager Robert catches twin sisters dying due to drugs contaminated with rat poison. Confused, Robert does not call for help but rather simply walks over to the girls and sits on the floor with them, pulling one into his lap as she dies. This scene, caught on Robert's camera and by another student on a cell phone, is repeatedly shown, but always from the same angle: with Robert's back to the viewer. The viewer cannot see her death but only hear her cries slowly subside. This is all caught on a video camera Robert was using for a school project. After the deaths, an atmosphere of paranoia and unease sets in among students and teachers, Robert being affected as well. The school claims that the drugs were bought outside the school and enforces a new, much harsher, drug policy wherein bags are searched and students are expelled. Robert and another student, Amy, are assigned to make a memorial video. The school is not happy with the result and has it re-edited, to make a smoother version. While making the video, Robert and Amy begin a romantic relationship, wherein they both have sexfor the first time in a wooded area. However, it is later hinted that their roommate may be involved romantically, as well. He fights with his roommate, who sold the drugs to the twins, and shouts that he killed the girls. The school questions him about this accusation, and is relieved that Robert says it was not substantiated. Robert is asked to take a leave of absence from the school. Toward the end of the film, we are finally shown the scene of the girls' deaths from the front and see Robert pressing his hand over her mouth and nose, smothering her. Later, Robert is shown at the school nurse, taking a daily dose of pills, showing that Robert is now on medication. The film ends as an unseen person with a cell phone videos him while he looks at two pictures of the deceased twins.
, the film holds an 80% approval rating on review aggregate website Rotten Tomatoes, based on 44 reviews with an average rating of 6.55/10. The website's critics consensus reads: "Antonio Campos' Afterschool is an intelligent, ambitious debut that boasts strong performances and plenty of ideas."
