The story begins with a pub dance where girls and boys enjoy themselves to the fullest in a much spoilt way, which leads to verbal eve-teasing and results in a girl's death. Sangayya IPS, the Assistant Commissioner of Police (ACP) of the area, is forced to revoke the case because of Chezhian's influence. Chezhian, with his rich and corrupt father MLA Deivanayagam, the State Minister for Forests and Agriculture, would bail them out even if Chezhian and his friends commit multiple murders. Chezhian falls in love with a girl named Reshma, the daughter of a Karnataka-based businessman (largely inspired by Vijay Mallya).

There are some political dramas that happen before the families agree to their marriage. Sangayya has been used in this political drama. He gets furious after learning this, but his hands are tied by the police commissioner. When Chezhian is mysteriously kidnapped and beaten up by an unknown character, Sangayya starts an unofficial investigation upon the commissioner's request. Sangayya solves the case and discovers that an 11th grade student named Easan is responsible.

Easan has a flashback sequence. His father was a government employee in their native village, where he and his mute sister Poorani did their schooling. Once Poorani finished school, they moved to Chennai so that she can pursue fashion technology. Poorani's classmates are all too rich and spoiled. She is taken by one of her classmates to a party, where she is raped by Chezhian and his friend Vinod multiple times. Easan's family, not being able to cope with the incident, commits suicide by drinking poisoned coffee, but Easan survived because he only drank a bit. Easan is rushed to the emergency, where Poorani's friend Shyamala visits him and reveals what happened to his sister. Due to the strong affection that he has for his sister, he decides to take revenge over the convicts.

Easan is a computer tech genius and uses this to change the online prescription of Vinoth, so that he is killed as a medical accident. He has also kidnapped and beaten the hell out of Chezhian. This is revealed to Sangayya by Easan himself, while Deivanayagam and his assistant arrive at the scene of investigation and find Chezhian's dead body. Deivanayagam and his assistant attack Sangayya and attempt to kill Easan by setting him on fire. Sangayya saves Easan and himself from Deivanayagam and his assistant by shooting and killing them. Easan is finally admitted in a juvenile reformatory and is visited by Sangayya and his family.