Sathya (Gautham Vasudev Menon) and Mathi (Simran) are a close-knit middle-class couple living in Madurai with their three children: a college-going son Bharath (Aadithya Bhaskar), an older daughter Vaidehi (Sathanya), and a 12-year-old daughter Ponnuthaayi (Aangelina Abraham). When Vaidehi attains puberty, she is advised by a strictly old-fashioned Mathi on how to stop behaving like a child and start acting like a woman, protect herself, and to lead a dignified and honorable life from now onward. But one night, Ponnuthayi is wrongly kidnapped (instead of Vaidehi) after her dance lessons and is sexually abused by a rich brat from their neighborhood. She comes back home traumatized, and the entire family is distraught at the wrong that befell their young child. Not wanting to go public with the incident, Mathi refuses to lodge a police complaint despite the pleas of Bharath and Sathya. Sathya is helpless as a father and struggles to cope up with his day-to-day life. Mathi tries her best to protect Ponnuthaayi from the prying eyes of her neighbors and relatives who start believing rumors following Ponnuthaayi's brief disappearance. Ponnuthaayi slowly recovers from her injuries, and Sathya gives her a reassurance that there is nothing wrong on her part and asks her to continue following her dreams. Mathi is unable to deal with the questions heaped at her and the stories framed by society. She briefly imagines pushing Ponnuthaayi off a cliff to avoid the dishonor, but she pulls herself together and is ashamed of her own thoughts. She resolves to continue living with her head held high. An angst-ridden Bharath manages to track down the perpetrator, who is his own college senior. He swears revenge, and with the help of his friends, he manages to castrate the culprit to prevent him from harming any other girl.
