David Billa (Ajith Kumar), a poor young Tamil villager along with several others, arrives at the town of Rameswaram in boat. After being interrogated by an arrogant civil servant, he is let into the labour camp where he befriends Ranjith (Yog Japee). Billa makes his presence felt, when he slaps Muthu (Theepatti Ganesh), one of the rogue workers around, for making a derogatory comment. The refugee camp is constantly terrorised by corrupt police officer Raghubir Sinha (Krishna Kumar (actor)). After witnessing the brutal murder of one of the inmates at his hands, Billa attacks Raghubir when he tries to forcefully detain one of his friends. Raghubir then gets Billa tortured in prison and vows to make him suffer. A few days later, Muthu calls Billa and Ranjith aside and promises them work. Billa and Ranjith are hired to transport fish from Rameswaram to Chennai. But unknown to them, the truck they were driving had diamonds inside, and Raghubir had alerted his men on the highway to catch them red-handed. As per the plot, they get caught in the check post, and after realising what had happened, Billa kills all the cops and drive the truck to its destination. Here they meet Selvaraj (Ilavarasu), who is pleased by Billa's loyalty and includes him in his businesses. Billa gets back and murders Raghubir and the civil servant. He then goes to meet his elder sister (Janaki Sabesh) and niece Jasmine (Parvathy Omanakuttan) in a church. When they see his gun, they realise he is involved in crime. Not knowing what to say, Billa simply walks away.