Bramayugam revolves around a family's struggles with a mysterious entity that invades their home. The story unfolds with Kuri (Mohanlal), a wealthy businessman, who moves into a new house with his family, unaware of the eerie presence that haunts the property. As bizarre events escalate, Kuri seeks the help of a spiritual expert (Arjun) to unravel the mystery behind the haunting. The film masterfully blends humor, horror, and drama, keeping the audience engaged throughout.