A student, Vijay (Vijayakanth), loves challenges and goes to any limit to win them. With an agreement with Arun, he captures Shanti (Viji) in a guest house for three days. Arun (Raja) is expelled from college by Professor Ramanajam (Venniradai Moorthy). Lalitha (Vijayalakshmi) goes to the teacher's house and gets raped, then commits suicide.

Appusami, Lalitha's brother (Y. G. Mahendra), asks his friend Vetri to kill the teacher at home, while Arun listens to their conversation and rejoins them shortly thereafter. Vetri asks Ramanajam to pretend to have killed him. Arun arrives, and Vetri tells that Appusami asked him to kill for a challenge. Arun kills the teacher without anyone knowing it and escapes.

While Vetri is being prosecuted by the police, it is Arun's father, Dharmaraj (P. S. Veerappa), who reveals that he has been killed. He is also wanted for many years by Vetri, who killed his father (V. Gopalakrishnan). Vetri is accused in court, but he reports that when he was a child (interpreted by Vijay), he denounced P. S. Veerappa for an attempt on his father, but the judge did not act. Finally, the supreme court releases him, and Vetri is pardoned and was released.