Balu (Sivaji Ganesan) and Velu (Gemini Ganesan) work in British Indian Air Force and are fighting with allied forces in World War II. Their plane crashes due to bombs dropped by Japanese. Velu is grievously injured. Balu carries him 50 miles to a village in Assam. There Velu regains consciousness and his health starts improving under the care of Indroma(Savithri) and her father, in whose house they are staying. Japanese soldiers come in search of these two. Balu hides Velu and when Japanese are about to discover Velu, he gives himself up to save Velu. Velu recovers, and marries Indroma, teaches her Tamil and calls her Indra. velu is found my members of British Indian army the day after his wedding and has to leave with them, leaving his wife behind. Indra is pregnant and gives birth to a child, however, their village is bombed and she loses her eyesight. When Velu comes in search of his wife, he only sees the ruins of the former village and grieves thinking his wife is dead and goes ...