A contemporary action drama that revolves around a young man’s love affair with his bike, and the trials and travails is forced to undergo when it is lost.

Prabhu (Dhanush) is a happy-go-lucky middle-class family guy who spends time playing carrom. He and his father (Murali) fall into minor misunderstandings, and he indulges in a romance with Hema (Divya Spandana). When Prabhu is caught in stealing a pittance from his father for booze with his friends, he questions his father’s responsibility towards his upbringing. His father gives Prabhu some of his savings and tells him to do something with his life. Prabhu purchases a Bajaj Pulsar bike and finds a job. The bike saves his life from a freak incident and later gets lost. When his family members ask him about his bike, he tells them that he has given it for dealer service.

The film has a deceptively casual beginning: a middle-class family consisting of parents (Kuyili and Ponvannan), a daughter and twin sons—Shiva (Jiiva), who works in a fish-market and Ashok Kumar (Jiiva, again), who is a lawyer. Shiva is a typical hero who attacks baddies with his bare fists; a rugged man who’ll brook no injustice. Devout Ashok’s goodness is a facade that hides his evil womanizing nature. Both have romantic interests; Shweta (Divya Spandana) is Shiva’s long-time sweetheart. Ashok’s life is one long, lustful journey as he charms every woman he meets into his bed. This is where the tale picks up. Shiva can do nothing right as far as his parents are concerned; they trust the Ashok and always misunderstand Shiva’s righteous anger and his every attempt to show up his Machiavellian twin fails. Ashok, on the other hand, is pally with the local goons and uses his brains to assist them in their nefarious activities. Matters come to a head when Ashok lures a girl called Gayatri (Honey Rose) with false pretences, ends up in having sex with her and eventually causing her to suicide when he learns that she becomes pregnant. Shiva lodges a complaint on Ashok but this fails as he couldn’t prove that whether it was him or Ashok who did the crime due to their faces. Shiva comes to know that a security man who saw Ashok pushing Gayatri from the roof. He tells the security man to meet him in the evening. But he is killed by Ashok as the security man saw him in the evening and thought him as Shiva. Shiva comes to know this thus begins a cat-and-mouse game between the siblings. This causes anger to the younger one and he tries to kill his elder brother. He employs a gang to kill his elder brother. Eventually the elder brother knows this plot and confronts him. During the fight the younger brother get killed by his own man. The elder brother walks with his father who for the first time accepts him.

Two villages on either side of a river are always feuding as the headmen Veerasamy (Vinu Chakravarthy) and Sethupathy (FEFSI Vijayan) have personal enmity. Due to some misunderstanding, Sethupathy’s children die, and the blame falls on Veerasamy. Sethupathy seeks revenge and tries to kill Veerasamy’s son but is saved by his servant’s son, but the boy disappears.
20 years later, Shiva (Arjun) is seen arriving in Kumbakonam, living with a bakery owner Veerabagu (Vadivelu). Shiva’s mission is to protect Devayani and her son from all sorts of gangsters. Priya (Reema Sen) walks into the bakery. Though she dislikes and torments Veerabhagu, she falls for Shiva. Sooner, Shiva’s true identity is revealed as he saves Devayani and her son from being murdered by Sethupathy’s son.

A father and son help each other through growing up, romance, tragedy, and adventure.