Kathirvel Murugan is a software engineer in Chennai. He shares his room with friend Sakkarai. Kathir hails from Usilampatti but wants to project him as city-bred and his ambition is to settle in USA. Kathir's father Sevaka Pandian opposes his son's attitude. An influential local chieftain, he is against inter-caste marriage and love. Kathir meets Nisha, who too wants to go abroad. Nisha loses her passport, and Kathir helps her find it. Slowly, he falls for her. Meanwhile, Sevaka Pandian arranges for his son's wedding with a High Court judge's daughter Thangameena. In the meantime, Kathir and Nisha get their visa and get ready to leave together for the USA.

Kathir thinks that he has escaped from his marriage, and when he wants to propose to Nisha, he gets a rude shock. She informs him that she is going to USA for her marriage. In the meantime, Sevaka Pandian learns of their relationship and kidnaps her. Afterwards Kathir also learns about it and saves Nisha, but her marriage is stopped. After ten months, they both meet in the same country again. Kathir doesn't want to see her, but his mind changes, and he tries to make Nisha love him. At last, they both fall in love with each other. Now they return to their hometown for their marriage. Initially, Sevaka Pandian doesn't allow. Later Kathir convinces them and they both marry each other making it a very happy ending.