Chotta (Daniel Balaji) is a terrorist, known for bombing various places in the past. He is currently jailed in a prison in Uttar Pradhesh, India. He escapes the jail by planting a bomb there and moves to various cities across India, while planting bombs everywhere, killing many people. His next target is Chennai and he heads towards the city to complete his mission. He often takes lifts from various vehicles across the highway. He communicates with his associates using a Gmail account, by composing his messages, saving them as drafts and providing the login details to his associates, who login later and delete the drafts meant for them after reading. Thus, their IP addresses remains untraced. The police issue a red-alert across the country and issue an order to arrest Chotta, all over India. His photo is faxed to all the police stations, who begin their search.

Kannan (Vimal), Ayyavu (Bharani), Rajamani (Gaurav Narayanan), and Mariappan (Nishanth) are four friends who live their lives in their own way in Madurai. They are callous youths who go hammer and tongs to make both ends meet. Kannan, a wedding videographer, comes across his childhood friend Radha (Anjali), who is a compere in a local cable TV channel, and love blossoms. However, one event changes the course of their life. Kannan bashes a youth for taking obscene video clippings of a girl and blackmailing her with ulterior motive. The youth’s father (Kamala theatre owner Raju) finds out the men behind the attack on his son. He hatches a conspiracy and ensures that the friends themselves turn foes for each other. In the meantime, it is time for Kannan to tie the knot with Radha. Did the baddie succeed in his mission is the crux of the story.

Muralipandian (Vikram Prabhu) is the only son of Chellapandian (Sathyaraj), a disabled policeman who is now working in the State Crime Records Bureau and expresses a desire to see his son in the police one day. However, Murali is against becoming a policeman due to an incident which happened in his childhood; when Chellapa lost his leg during police duty, his wife fell down the stairs on hearing the news, leading to her death and left a crippled Chellapa to single-handedly look after the young Murali. His ambition is to become a bank manager, and he manages to get an interview for the same in a bank. While on a pilgrimage, Murali meets Ambujam (Monal Gajjar), a young doctor who is travelling with her chaperone, who is her grandmother Aishwarya (Kovai Sarala). Ambujam initially thinks ill of Murali due to unsavoury incidents which occur between them during the journey, but after she finds out about Murali’s true character and he helps her Aishwarya recover from dehydration, she falls in love with him. She expresses a distaste for marrying policemen, which impresses Murali.