Thavasi alias Chinna Gounder is a rich and respected landlord in Coimbatore district. His family has been the hereditaray Village Judge for a group of 18 villages and Thavasi takes over that work 10 years after his dad's death. Thavasi father, in an ill condition was asked to preside over a very tricky case and died before passing judgement. The case was that then newly built village temple stood on a land belonging to Sundari, the concubine of another landlord and Thavasi's sister's husband Sakkara Gounder. Sakkara had cited law and sealed off the temple premises days before its opening. Thavasi investigates the case, and clearly proves that the document of land purchase is fake, and decrees that the temple premises belongs to the Village. He is appreciated by a district judge upon seeing his swift decision-making skills. Chinna Gounder lives with his mother Aatha and is the most respectable person in the village, known for his justice and loyalty. Rivalry exists between Chinna Gounder and his brother-in-law Sakkara Gounder, who is accused of marrying Sundari, following Chinna Gounder's sister's death.

Sakkara Gounder plans to grab the local temple premises by forging false documents, but Chinna Gounder exposes the frauds committed, thereby preventing the temple premises from going into the hands of the roadies. Sakkara Gounder is angered and waits for an opportunity to knock out Chinna Gounder.

Deivanai is a poor, talkative girl in the village. Deivanai often gets into silly verbal conflicts with Chinna Gounder and his mother. One day, Chinna Gounder's mother is bitten by a snake in their farm and is luckily spotted by Deivanai, who offers help, and her life is saved. Chinna Gounder thanks Deivanai for her timely help and offers her money, which she does not accept. Chinna Gounder is impressed upon seeing her genuineness.

Deivanai owes some money to Sakkara Gounder which she had borrowed for her younger sister's education. As she could not repay the debt in the timely manner, she offers to serve food for everyone and collect some money donated by the invitees after having the food (that is the custom followed in the village for those who are unable to repay debt). Chinna Gounder offers a marriage proposal to Deivanai as he says that he is also bound to repay for the timely help offered by her, which saved his mother's life.

Chinna Gounder is married to Deivanai, and life progresses smoothly for sometime, until Sakkara Gounder interferes with a plan. Sakkara Gounder poisons the local pond and blames Chinna Gounder for that. He also sets up a false witness to trap Chinna Gounder. Deivanai overhears Sakkara Gounder's plans, and in the act of trying to stop the witness from reaching the panchayat, she attacks the witness with a sickle. Later, the police arrests Deivanai with a murder charge, as the man whom she attacked is dead. Deivanai is jailed in the event of saving her husband.

Deivanai's sister now comes to Chinna Gounder's home as she is left alone. One day, it is revealed that Deivanai's sister is pregnant, and Chinna Gounder is blamed for that too. As Chinna Gounder also remains silent over the issue, his mother sends him out of their house. Deivanai is shocked upon hearing this and believes that her husband has betrayed her trust and love. She refuses to even meet him when he comes to visit her in jail.

A few months pass by, and Deivanai comes from jail to visit her sister, who is about to deliver a baby. She scolds her sister for having an illicit relationship with Chinna Gounder. However, her sister reveals that he is no way related to her pregnancy. A small flashback is shown where Deivanai's sister was in love with a local villager (the same guy who was falsely set up as a witness against Chinna Gounder and was killed by Deivanai), following which she got pregnant. As Chinna Gounder does not want to tarnish her image in front of the villagers, he accepted the blame. Deivanai realizes her mistake and apologizes to her husband. Deivanai's sister gives birth to a baby and dies.

Now the advocate, who already knows about Chinna Gounder, finds out that he is in trouble and decides to offer help. He takes over the case in favor of Deivanai and begins his ground work. He gets the postmortem report and finds out that the cause of death of the man attacked by Deivanai was lack of breath. Meanwhile, Deivanai is kidnapped by Sakkara Gounder. Chinna Gounder comes to her rescue and saves her. Chinna Gounder produces Sakkara Gounder in front of the village panchayat, where it is revealed that it was him who killed the witness and decided to blame Deivanai. In the end, Chinna Gounder and Deivanai come out clean from the accusations made over them. Sakkara Gounder begs the villagers to forgive him, but no one listens to him. Chinna Gounder then forgives him for all his misdeeds by stating that he only wanted Sakkara Gounder to realise his mistakes.