The story starts with the special birthday celebration of a girl. Vasudevan (Sivaji Ganesan) narrates the story which goes back 14 years behind. Karunakaran (S. V. Subbaiah) and Vasudevan (Master Baji) are brothers whose parents had died. They are very much loving and close to each other but Vasudevan longs for mother's love.Much to the relatives persuasion, Karunakaran accepts to marry Sulochana (Padmini). Vasudevan gets angry as he is notified regarding this and would accept not this wedding to take place if he does not like the bride. He sets off to the bride's house and he likes her at the first glimpse. The wedding takes place and Sulochana becomes a loving and passionate wife as well as sister-in-law. Vasudevan treats and accepts her as his own mother. Meanwhile, Sulochana gets pregnant and deliveres a baby boy but the baby dies soon after.