A young woman regresses to childhood after suffering a head injury in a car crash. Lost, she ends up trapped at a brothel before being rescued by a lonely school teacher who falls in love with her.

Krishnaswamy (Kamal Haasan) is a widower living happily along with his mother-in-law Saraswathi (S. N. Lakshmi), daughter Kaveri (Mahanadi Shobana) and son Bharani (Mahanadhi Dinesh) in a village near Trichy. Dhanush (Cochin Haneefa), a con from the city,