The success of success Nani-Nithya Menon combo in Ala Modalaindi created a hype on their next film Sega. Adding to that the movie is coming from Gautham Menon's home production Photon Kathaas. But the poor screenplay by newcomer Anjana Ali Khan has played the spoilsport.
Karthik (Nani) and Balaji (Muthukumar) are the sons of a drunkard, who left the family to their fate. Their mother, who was a patient, commits suicide by taking poison from the hands of Balaji. Karthik and Balaji were brought up by their uncle, who is a painter. Though Balaji ekes out a living by painting the sign boards, he wants to give a good education to Karthik. Karthik and his uncle’s daughter (Nithya Menon) love each other. Karthik has a friend called Vishnu (Karthik), who runs a mechanic shed. Karthik’s father, who was once a drunkard turns a broker and runs a brothel on his own. He has the support of Ammaji (Jennifer) who smuggles drugs and used to drug-trafficking.
Vishnu falls in love with Vani (Bindu Madhavi), a prostitute in the brothel. Once, Vishnu meets the broker and agrees to transport the drugs to Goa on a condition that the broker should leave Vani to her. However, Vani comes to know that the broker is planning to get rid of both Vishnu and Karthik and alerts them. While Karthik and Vishnu returns to their place there was a minor scuffle and after Karthik suffers a head injury, Vishnu gets killed. Everybody presumes that Karthik killed Vishnu. What happens next should be seen on-screen.