An unnamed orphan who was abandoned in the garbage soon after his birth, grows up to be a ruffian who does anything for money. On one occasion, he rapes Seetha, a bride-to-be, on the eve of her wedding at the instruction of Annapoorani, who Seetha had earlier exposed for her malpractices in running an orphanage and got her arrested. Though the sympathetic bridegroom offers to marry Seetha, she declines his offer. Instead, she takes residence in the house of Aaya, who lives in the same slum as the ruffian. She attempts to develop the ruffian's acquaintance, much to everyone's disbelief. Their constant confrontations bring about a chemistry in their relationship. She narrates to the people in the area that he molested her and the sequences which forced her to leave her father and live in the slum. They sympathise with her and everyone feels that the ruffian has to accept her as he is responsible for her present pitiable condition. Consequently, Seetha moves into his house. Her tender love and affection eventually leads to their marriage. Seetha advises him to shed the path of violence and reform himself. He is named Seetharaman.

Seetharaman slowly changes and tries to work hard in a righteous way to run his family. Seetha later gives birth to his son. However, Seetharaman's past sins do not spare him. Thoguthi, for whom Seetharaman previously worked, kills Annapoorani when she demands her share from his illegal gains. Seetharaman is arrested as he was working for Thoguthi earlier. To get exonerated, he is forced to become an approver and report Thoguthi's activities. Thoguthi decides to kill Seetharaman to halt his appearance in court. He plants a bomb in a lunchbox (identical to the one sent by Seetha to Seetharaman) and replaces it with the original. The bomb is planted in such a way that it would explode immediately when the lunchbox is opened. Seetharaman, busy working for extra money to buy a gift for Seetha and their wedding anniversary, does not have lunch. He returns with the lunchbox and leaves to visit the temple with Seetha. When Seetha returns home to take her child's feeding bottle which she had forgotten, she opens the lunchbox out of curiosity, expecting a gift from her husband, and dies in the ensuing explosion. Enraged, Seetharaman attacks and almost kills Thoguthi, but his child's cries remind him of his responsibilities, so he spares Thoguthi's life. Thoguthi chases Seetharaman, but is struck to death by a vehicle. Seetharaman leaves with his child and brings him up.