After graduating, a young man and a girl, who are in love with each other, promise to meet again after five years in their college campus. When he does show up on the set day, his friends are shocked to see that he has completely changed.
Amravathi, a naive girl, runs away from home and finds shelter in Arjun's house, who takes good care of her. However, when Arjun falls in love with Amravathi, her life takes a turn.
Nachiappan College is considered to be one of the worst college of Chennai; everyday violence erupts between two final-year groups. The students are influenced by the local bigwig Beeda Settu, who sells ganja to the students and basically rules the college from outside. The first group is led by Sudhakar whereas the other one is led by Kalaiarasan. The college management and the police get tired of that situation. They decide that they need to change the principal. The vice-president, Chandran, dies to sit in that post but the college management asks the successful Shanmugasundaram to take the post. His daughter Shobana will study in the same college. The rest of the story is how Shanmugasundaram succeeds in his mission.
