Annam (Sujatha) lives with her elder sister and brother-in-law Madasamy (Senthamarai) after her parents' death. A cheerful person always ready to help people around, she is the village midwife and people consider her as a lucky mascot. Thyagarajan (Sivakumar) comes to her village as a school teacher. Their first meeting starts with a small fight, but soon they become good friends and Annam falls for him and comes to his help, whenever he is in need. Thyagarajan also loves her but does not propose to her, as he is financially not settled and also has the responsibility of getting his elder sister married. Sumathi (Jayalakshmi) daughter of the village Panchayat head, Vadivel Ambalam (S.V. Subbiah), and a friend of Annam returns to the village after completing her education. She befriends Thyagarajan as he is the only educated person in the village and soon falls for him. Learning this, her father approaches Thyagarajan's mother; when she tells him that her elder daughter is an obstacle, Vadivel Ambalam promises to help them financially to get her married and thus Thyagarajan is forced to say "yes" to the proposal, though reluctantly. Annam is shocked when she learns about the wedding through Sumathi. But she gracefully becomes a part of their wedding work. The couple migrates to a different city after the wedding.
Azhagappan (Thengai Srinivasan), a womanizer, runs a theatre in the village and molests several women. He casts his eyes on Annam. Through her brother-in-law Madasamy, he makes her come to the deserted theatre and attempts to rape her. She assaults him and escapes. An angry Azhagappan vows to avenge. Thyagarajan and wife Sumathi return to the village with their son Babu after a few years. Babu instantly connects with Annam. Thyagarajan feels guilty for Annam's solitude. When they spend some time together alone exchanging pleasantries, Azhagappan blows it out of proportion and makes Madasamy complain about it as an affair to the village Panchayat. The Panchayat calls for a hearing and the hidden agenda of Azhagappan is exposed by Magudapathy (Srikanth) a relative and suitor to Annam. Azhagappan is excommunicated from the village by the Panchayat. Magudapathy gets killed by Azhagappan's people for exposing him. In order to take revenge on Annam, he kidnaps Thyagarajan's son Babu and demands that Annam meet him alone at the theatre. Annam comes to the rescue and in the process of saving Babu, she dies in the stampede when a fire occurs at the theatre. She dies on the lap of Thyagarajan happily, after saving Babu's life.
[from the book Pride of Tamil Cinema: 1931 to 2031, by G Dhananjayan, Blue Ocean Publishers, 2014]]