Set in ancient Kerala, where mysticism and folklore reign supreme, "Bramayugam" follows the journey of Thevan, a folk singer belonging to the Paanan caste. Fleeing from slavery, Thevan stumbles upon a mysterious mansion hidden deep within a forest. Welcomed by its seemingly benevolent master and servant, Thevan soon discovers that the master is, in fact, a malevolent goblin known as Chaathan, who ensnares unsuspecting visitors to become his lifelong servants. As Thevan and the mansion's first servant grapple with breaking free from the goblin's control, the story unfolds into a chilling tale of darkness, folklore, and destiny.