Three young bachelors Pandiyan (Pandiyan), Anand (Anand Babu) and Babu (Babu) are friends and room-mates in an apartment. One day, Pandiyan warns his friends that a parcel will arrive during his absence. The next day, Anand and Babu find a baby (Baby Radha) before their door. The three bachelors swear that they are not her father. Since then, their lives are completely changed. First, they try to abandon the baby but then they take care of the baby and name her Thayamma. What transpires later forms the crux of the story.