In a small town, Needy Lesnicki's life takes an unexpected turn when her best friend, Jennifer, mysteriously disappears. Jennifer, an attractive and popular girl, has always been the center of attention, but her charm hides a dark side. After being possessed by a demonic force following a failed ritual by an indie rock band, she begins to transform her classmates into bloody victims, driven by an insatiable appetite.
Needy, a quieter and more grounded girl, starts to notice unsettling changes in Jennifer's personality. Her friend Luca tries to help, but soon realizes that danger is looming over them. As the murders pile up, Needy feels increasingly trapped between loyalty to her friend and the horror unleashed by her behavior. The tension escalates when Needy becomes Jennifer's sole target, who seems poised to destabilize the fragile line between friendship and betrayal.
In a survival game, Needy must unravel the mystery of Jennifer's transformation and find a way to stop her before it's too late. Amid laughter and chilling moments, the film explores the ravages of youth, toxic friendship, and the struggle for power, as the girls confront the monsters that arise both within and outside of themselves.