Kaattu Vannu Vilichapol movie is all about Sita (Chippy) who comes home to her parents after she elopes with Unni (Krishnakumar) her lover who is a journalist in Mumbai. Unni is missing for 3 months, and pregnant Sita has only her parents to turn for help. Despite the problems with their daughter, her parents give her a warm welcome. One fine morning, she hears the news that her husband committed suicide after being identified as an AIDS patient. The news spread like wild fire in the village, and people looked at her with disgust and suspicion that she might also be an AIDS patient. Movie takes an unexpected turn when Unni's friend comes to meet Sita.