Lachi is a hard-working 19-year-old girl who supports her family after her father's mysterious death. While she was traveling on a train, Mulla, a gangester and his men from a local colony named "KARAKKATTU COLONY" enter. They argue over silly issues, and he discovers a baby in a bag on the train. They try to find the baby's parents but fail. Mulla decides to adopt the child and eventually, Mulla and Lachi fall in love.
Lachi's uncle, CI Bharathan, who murdered Lachi's father and the baby's parents, wants to break up the two to keep his secrets. He kills Mulla's friend, Ambi, who helped Bharathan kill Lachi's father as he thought that Ambi would reveal the truth to Lachi. Finally, Mulla and Bharathan get into a fight, where Mulla kills Bharathan and avenges Ambi's death. However, Lachi tells the police that she committed the murder and goes to prison. After five years, when she returns, she finds that Mulla has lost one leg in a fight between the colony residents and the police. The colony residents had started a new business, and they all are having a good life now. The only thing they lacked was Lachi's presence. Lachi and Mulla finally unite.
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