Factory owner Maryati exploits her employees with excessively long shifts, luring them with incentives to make them prioritise productivity and greed over sleep. Putri is convinced that, because of this, her mother, who worked in the factory, committed suicide. Her sister Ida, however, believes that their mother died from being possessed. She thinks that whenever the workers grow weak from exhaustion, a dark and evil figure emerges and takes possession of their bodies.