Amarkalam is the story of Vasu, a ruthless man who lives in a cinema hall. He had an unfortunate childhood and he drowns all his sorries in alcohol. Vasu's friend Dhamu loses a reel of the movie Annamalai to Mohana. This creates a clash between Vasu and Mohana. However, Mohana soon falls in love with her. The movie chronicles his efforts to prove that his love was true.