'Jayammana Maga' is all about black magic and human sacrifice. It is a battle between good and evil. The movie also projects a belief that God comes to the rescue of his people when in need.
Naga (Vijay), the son of Jayamma (Kalyani), stays with his mother near a temple. While the former does not believe in God, the latter is spiritual. But Naga believes in helping people. The ghosts, which are captured in dolls, are brought under control by him through the voodoo process of sticking pins or nails into the doll.
Divya (Dr Bharathi) comes to his life when she comes to perform a ritual in the temple. As expected, he starts liking her. At this juncture, a black magician wants to make a human sacrifice and it is his leading lady, who is the target.
Vijay is faced with some tough decisions and he, along with his mother become a part of a bigger scheme. What happens next creates intrigue and forms the crux of the movie.