Lenin Vijay, Suresh, Akhil and Karthi, were four carefree and adventurous friends who are final year students in an engineering college in the outskirts of Trichy. The film opens by showcasing the daily lives of the four student friends. The students soon meet the politician, Kumar, who is eager to begin his own caste-based political party. He also runs a roadside dhaba frequently visited by the students.

In many subsequent events, the students get into trouble with the local residents. In one such instance in the dhaba, Kumar comes to their rescue, and hence, they get in touch with each other. Later that night, however, one of the students is attacked by some of the local residents. This infuriates some other students, who then chase the locals, and a fight ensues.

Meanwhile, Lenin's ex-girlfriend Agnes is harassed by Ramanathan, a part-time engineering student. This is witnessed by Karthi, who confronts and physically assaults Ramanathan and then narrates these events to Lenin. Later, to their surprise, Ramanathan's friends wait in the dhaba to ambush Karthi. Ramanathan, who has little luck with love, yearns for one college student who seems to be the ex-girlfriend of Lenin. One night, the four friends get very drunk and accidentally annoy some of the caste fanatics. Kumar, along with his uncle, happens to see this and contemplates how to take advantage of this tense situation.

While all this is happening, Kumar drafts plans to initiate a caste-based political party about which he has been dreaming. The plot ends when all three sets of characters meet, and each of them discovers their mutual interconnections.