Vamsam is the launch pad of debutant Arulnidhi, grand son of Chief Minister M Karunanidhi. It is the second film of director Pandiraj, after his impressive debut in Pasanga. This time Pandiraj has turned to age old village sentiment and bloodshed story.
Pulivathanam and Singampidari are neighboring villages where the Devar Community has the stronghold. Every year they perform fortnight-long annual festival at the local temple which is controlled by the village chief Seenikannu (Jayaprakash), a cunning man. Anbarasu (Arulnidhi) lives in the village with his widowed mother (Anupama), a local school teacher. He has been brought up strictly by his mother and he is a model citizen, and prefers to be a farmer.
One day he meets Malar (Sunaina), a bubbly and funny girl from the neighboring village, where her father is the village chief. They fall in love. But Seenikannu Devar,father of Malar, opposes their marriage as he had Enmity against Anba's father Rathinam (Kishore). The big twist in the story takes place when Seenikannu is humiliated by Malar in front of the villagers.