The story opens with a female voice narrating about herself and her love story with Ibrahim. Ibrahim works for Mohammad Rowther, a goon who deals drugs. He marries Jaya under her parents' disapproval, and she converts to Islam, changing her name as Razia. Everything seems to go well when one fine day, Ibrahim is shot dead in an encounter in front of Razia. This also leads Razia to suffer a miscarriage. She vows to get revenge.

Razia seeks the help of Abdullah, who reveals the real motive of Ibrahim's encounter. He tells that Rowther's younger son, Hussain, had eyes upon Razia and was warned by his family members as she is someone else's wife. Rajendran, a drug delivery guy in Rowther's gang, goes to deliver drugs to a rave party of high-class youngsters. He gives them spare drugs in exchange for a deep kiss with Janaki, who happens to be daughter of the State minister supporting the drug business. The video of the kiss leaks to the media, and Kareem, Rowther's elder son, kills off Rajendran in a fit of anger. At the same time, Hussain attempts suicide, due to not getting Razia. At the hospital, Rowther gets news that police need to kill someone in an encounter to save face, with both the public and the minister. Rowther cleverly pits Ibrahim against the police, so that Hussain can marry Razia, and thus Ibrahim is killed.

Razia is then sent by Abdullah to Mumbai to meet Boxie, who at first looks at her meanly but later understands her willpower. He keeps her in his gang and trains her to kill Rowther and his gang.

Finally, a well-trained Razia lands up at Chennai and kills Kareem as well as the police who were involved in Ibrahim's encounter. Rowther learns of his son's murder and orders Lala Settu and Edison to kill everybody who is responsible for his son's murder. Lala Settu tricks Boxie by offering him help to do his drug business in Chennai in the place of Rowther and then kills Boxie and his henchmen. Meanwhile, Razia goes hunting for Hussain and kills him. The police catches her, and they help her kill Rowther as they could not arrest him and stop his drug business as he had Minister Tamizhvannan's support. Later, Lala Settu and Edison are killed by the police, and Razia also lets the police shoot her.

In the end credits, the police are praised for their mission, and Deputy Commissioner Ramachandran helps Razia's sisters get jobs in the police department in return for the favour that she did to the police department.