This poignant family drama delves into the struggles faced by the members of a close-knit and happy family, comprising of Aravindan, his wife, Janu and their three daughters. The youngest daughter, Rajni is loved and petted by one and all. The family lead a happy and contented life.
In a cruel twist of fate, Aravindan is diagnosed with lung cancer and is deeply traumatised, because he is aware of his responsibility of ensuring the welfare of three daughters. Without revealing the true seriousness of his condition, Aravindan leaves for Mumbai, on promotion. While the family desperately misses him, Rajni becomes friendly with a neighbour, Dr Surendran, who is a kind doctor. Rajni is a fragile child, and when she falls ill, the doctor states that she would need heart surgery at the earliest.
When Janu writes to Aravindan about the need for his immediate return, he is forced to admit the seriousness of this condition. Janu immediately travels to Mumbai, but it is only to see her husband in the final stages of life. Taking into account Rajni's condition Aravindan takes a promise from Janu not to reveal the truth about his passing to the children. What further complications will Janu have to face in life? Will Dr Surendran succeed in saving Rajni's life and restore her to good health? How will the future unfold for the family?