The movie revolves around Viswanathan, his wife, Meera, and his son, Vasudev, who are a happy family. Although Meera is Vasu's stepmother, they are very close to each other. Meera loves Vasu as her own son, and Vasu considers Meera as not only his mother but also his best friend.
In the meantime, Meera gives birth to a son and Vasu is the happiest. He names his little brother Appu and cares much for him. After Appu is born, his parents start paying more attention to the baby while Vasu feels left out. On Appu's birthday, Vasu buys him a small gift with the pennies he had saved. But when he sees everyone giving expensive and much costlier gifts, he feels disappointed and hides his gift. He feels insecure when he sees his parents caring for Appu more while not being attentive towards him. Feeling dejected, one day Vasu and his father fall into an argument and Vishwanathan goes to the extent of slapping Vasudev. This begins to create problems leading Vasu to unintentionally kill the baby, which in turn gets him imprisoned in the juvenile home. After completing the terms in the juvenile home, he comes back to the home and gets a surprise from Meera in the form of another baby as his step-brother. He names the baby Appu and gives him the old gift he bought for the deceased baby. Viswanathan and Meera are happy about their bonding.