Nirmala, an orphan Christian girl, lives in a convent and she wants to become a nun. She is then sent to a village by the convent for becoming a nun. She joins, the church's father Vincent Parker Soosai and she works as a nurse until she becomes a nun.

She then meets Muthuvel, an innocent young man, and they fall in love with each other. Rathnavel brings up his son Muthuvel without any affections and treats him like his worker, whereas his mother Vadivu loves him more than anything. When Rathnavel arranges Muthuvel's marriage with his niece, Muthuvel and Nirmala reveal him about their love. Rathnavel finally accepts for their marriage with Soosai's help. Nirmala is eager for her wedding and leaves the village for taking with her the convent's sisters.

In the meantime, Rathnavel prepares the puberty ceremony of Rajalakshmi, Muthuvel's niece, and manages to hide a Thaali inside a flower garland. Muthuvel, as an uncle and as per the customs, puts the flower garland around Rajalakshmi's neck and he married her without knowing. Soosai complains against Rathnavel for arranging a child marriage but the complaint is withdrawn. The rest of the story is what happens to Muthuvel and Nirmala.