Tamil Nadu State Law minister Sadasivam asks for his illegal minister's allocation quota in student admissions in Chennai Government Law College, but the new principal refuses to yield, as the students in the quota are unfit to study law. In order to remove the principal, he plans and instigates violence in the campus using his men studying there. Many students die due to this clash, and the college is closed for two months. Gunasekaran, a 27-year-old MBA-graduate hears the cries of the dead student's mother. He gets enraged and takes the matter seriously.

Guna kidnaps Eeswaran, the paroled-brother of Sadasivam and houses him in a half built bathroom at an abandoned construction site for 6 days. Eeswaran is forced to drink latrine water to stay alive. At the same time, due to certain coincidences, Guna meets and falls for Malini. Their families meet and agree for their wedding. Eeswaran's deadline to return to prison ends and Sadasivam tries to find him but to no avail. Sadasivam is arrested as he had given legal assurance for his brother's parole, and is removed from the state cabinet. Guna releases a fainted Eeswaran, who is promptly arrested. Eeswaran escapes custody by killing three policemen and searches for his kidnapper.

Due to an error by Guna, Eeswaran captures Malini using her bank account number and ties her disguised as a scarecrow atop the same building where he was confined. Guna and Malini's family start searching for Malini. In the meantime, to protect the ruling party's image, Sadasivam is killed in a made-up encounter. When Eeswaran is nearly caught by the police, he boards a bike, which is being driven by Guna himself. They both reach the building where Malini is held and realize the truth. In the ensuing melee, Guna kills Eeswaran by snapping his neck, and rescues Malini. Both of them are admitted in the hospital, where police officer DCP Aravindan visits them. The police have closed Eeswaran's death as an encounter and Aravindan receives his promotion.