In 1970, a marine engineer Lenin (Cheran) from Calcutta comes across a Nagore girl Nadira (Padmapriya). The relationship began as friendship, but later sparked into love, continues as Lenin faithfully mails a letter once a month. When Lenin finally gets the opportunity to return to Nagore, he is gravely disappointed as Nadira and her family have left the place after selling their home.
Years later, Mahesh (Aryan Rajesh), son of Lenin, discovers his father's hidden life after having read his diary. With help from his friend Shamsudeen (Ajai.R), He marches his way to find Nadira and deliver the letter to her. He comes to know that Nadira has shifted to Malaysia after marriage. He goes to Malaysia to meet her. Once he reaches her house, he is greeted by Nadira's son who welcomes him to the house. Nadira is now very old and asks Mahesh as to who he is and how does he know her? He replies saying he is Lenin's son and also informs her that his father died few years back.
Nadira is grief-stricken. Mahesh gives her Lenin's last few letters which he could not post because he did not have Nadira's address. In those letters, Lenin has spoken about his journey to find Nadira after she and her family shifted from Nagore. He describes his pain and grief over not knowing about her situation during those days, and also about his father who coaxed him to marry another girl (played by Anupama Kumar), who is now his wife and is very understanding.
While on the way to the airport, Nadira requests Mahesh to let her talk to his mother. Nadira and Mahesh's mother exchange notes. the airport, she reminisces about past events, remembering how she expressed her anguish and punished her father by denying to marry anyone. True to her word, she remained single, living sister and her lovable family to this day. Deeply regretful of past events, she apologises and promises Lenin that she will join him soon and never separate.
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