The story pivots around Raji (Seema), a young prostitute, and three young men in her life: Two college-going youngsters, Babu (Ravikumar), Jayan (Sukumaran) and a school teacher Chandran (M. G. Soman).

Raji loses her parents early in her life, leaving the responsibility of bringing up her younger brother Sudhakaran (Master Raghu) on her shoulders. Circumstances and her unskilled status force her into the life of a prostitute. She begins living in a slum with (Meenakumari) and a cycle-rickshaw driver Damu (Kuthiravattom Pappu), her 'agent' or pimp.

Babu is a student who stays in a nearby hostel. Raji falls for Babu and becomes a regular visitor at his flat, even though he, afraid for his reputation, repeatedly tries to throw her out. Raji's declares her love for Babu but says that she does not want to have sexual relations with him, as then he would be like another customer. However, she cajoles him into letting her sleep at his place on the floor, gently refusing his romantic overtures. News spreads about Babu's relationship with Raji, assumed falsely to be that of a customer and prostitute.

Raji's brother Sudhakaran has a teacher-student relationship with Chandran. One day a beggar steals Chandran's wrist watch through an open window. Sudhakaran is arrested by the police, because he is a regular at Chandran's room, and is the immediate suspect. He is beaten up by the cops in police custody and dies from the physical trauma after his release. The real thief is later arrested; Chandran is uneasy about it and whether his hasty judgement resulted in the boy's loss of life. From remorse, Chandran offers money to Raji, but she refuses to accept it or forgive him in any manner.

Babus's father Karunakaran (Bahadoor) decides to marry his son off to his wife Lakshmi's (Kaviyoor Ponnamma) brother's daughter, Damodaran's (Sankaradi) daughter Radha (Usharani). Karunakaran, Damodaran, and Radha visit Babu's hostel room and are shocked to see Raji in there, who, as usual, was just there to talk to Babu and be with him. They, of course, assume that the two are sleeping together. Damodaran, ashamed and angered, breaks off the engagement and marries Radha off to another man.

Jayan, who had had a severe drinking problem, dies of liver-related complications. On his death bed he asks Babu to not abandon Raji and emphasizes it with the justification that her love for him is pure, even if its 'impure' in the eyes of society. Raji gets gang-raped and Chandran's timely intervention saves her; Raji then finally begins to forgive Chandran.

Babu's mother believes her son's denials of impropriety with Raji, and comes to meet Babu and eventually Raji. She takes pity on Raji when she comes to know about her past and her son's blind love for her. Lakshmi accepts her as her daughter-in-law and takes her home, and eventually Babu's father is also forced to accept Raji as his daughter-in-law.

The music was composed by A. T. Ummer and the lyrics were written by Bichu Thirumala. Guna Singh composed the background score.

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