Karthikeyan (Arjun) is a photographer-cum-editor working in Indian Express. Chitra (Meena) is a bank employee. Both reside in Navi Mumbai. Karthik meets Chitra while opening a bank account. While returning home, Karthik again meets her in a train. He offers his seat but Chitra does not want to accept it. During a train strike he invites her to travel in an auto to reduce expenses, but she declines. When Chitra hesitated to travel in the same train with Karthik, he became angry and explained that he talked to her because both are from same area and he says he will never talk to her anymore. After some days Chitra volunteerily talks to him. Karthik, in return, accompanies her to a police station to get back her snatched handbag. Karthik invites Chitra to his home to meet his parents. Karthik's parents like Chitra and all become friends. Karthik's mother requests Chitra to tell Karthik to get married. When she conveys his parent's wish, Karthik explains about his wife (Jyothika) who died in a train accident. Karthik learns that Chitra's husband Srikanth (Ramesh Aravind) who died in the same train accident. Chitra adopted a boy, Shiva, per her husband's wish. Karthik's parents want them to get married. Shiva moves close to Karthik and his family, while Chitra tries to prevent relations with Karthik. Karthik's father (Nagesh) understands Karthik's interest towards Chitra. He asks her to marry Karthik. She refuses and, once for all, avoids Karthik. Karthik understood her intention and stayed away from her. Chitra meanwhile gets confused regarding second marriage due to the trouble given by her neighbour's husband and Shiva's passion for Karthik. Chitra's neighbour once attempts to rape her; she manages to escape. Karthik who heard about it attacks the man for misbehaving and makes him vacate Mumbai.