On a rainy night, Ganga, a college girl from an orthodox
Tamil Brahmin family in
Srirangam, is sexually assaulted by a stranger after he offers her a ride in his car. She returns home dazed from the experience and when asked by her mother Kanagam about what happened, she confesses. Kanagam creates a ruckus; all the neighbours and relatives learn of it. Ganga's brother, the family's
breadwinner, disowns and evicts her from the house. At the request of Kanagam, Ganga's maternal uncle Vengu takes her with him to
Madras, and Ganga continues her education there. After graduating, she gets employed in a private firm and grows to take the top managerial position. Exploiting her blemished status, Vengu, who was once her guardian, makes sexual advances towards her several times, forcing Ganga to make Kanagam stay with her to keep herself protected from Vengu. R. K. Viswanatha Sarma, a writer who witnessed Ganga entering the car on that rainy night, writes a story in a magazine in which the lead character, a girl, is molested by a stranger; after she returns home, her mother conceals the truth, cleanses her through a bath and the girl is able to live normally. Ganga reads the story and recommends it to Kanagam, which makes her feel guilty about the ruckus she had created. Ganga, though successful at her workplace, remains withdrawn and aloof in life. When she rejects Vengu's advances, he challenges her to locate the stranger who had sex with her and live with him if she has the guts. Accepting the challenge, she takes Viswanatha Sarma's help, and locates Prabhakar alias Prabhu who offered her a ride on that rainy night. Prabhu is already married and has an adolescent daughter. He does not initially recognise Ganga. When he is made to recollect the experience, he feels upset. Prabhu says he thought she was a consenting partner and did not realise he was imposing himself. Ganga and Prabhu's subsequent meetings result in friendship which then matures into love. The new relationship is, however, unacceptable to both families. Unable to transcend the society's norms, Prabhu advises Ganga to marry someone else. When all attempts to convince Prabhu fail, choosing to live with her memories, Ganga parts ways with him. == Cast ==