The film is about relationships between two families where hardships and affections are on the competencies.
It centers on five brothers: Elder one As the film moves ahead it unravels about enmity with other family where Devasena (Simran) is a pampered daughter. But Gunasekaran is kind enough in breaking the hardships and getting united by arranging nuptials for Devasena with his brother Karunakaran. However, Devasena mistakes Prabhakaran to be her bridegroom. When things are unraveled and Prabhakaran turns away from Devasena’s offer of marrying him, she vows to alienate him from his family by marrying Karunakaran.
Rest of the film is about the hand-in-hand combat between Prabhakaran and Devasena with each one moving around with their smart plans.
Jani, a slum boy, loves Sandhya but doesn’t express his love because she sees him as her friend. Jani selects a groom photo as per Sandhya’s request, but when he learns a shocking truth about the groom, he tries to break up the marriage and earns a bad name.
Saraswathi “Yamuna” (Suvalakshmi), one of two daughters of an Orthodox father (Poornam Vishwanathan), comes to Madras for finishing her studies. Major Madhavan (Prakash Raj) is the husband of Yamuna’s elder sister Ganga (Rohini), who infatuates about Yamuna after seeing a photo in a letter sent by her. Meanwhile, Yamuna meets Jeevanantham (Ajith Kumar) in a bus, who gives his ticket to her as she had not taken her own. Later one day, Jeeva decides to express his love to Yamuna by writing “1 4 3” (the number of letters in “I love you”) in a letter and giving it to her, but he witnesses a group beating a boy who did the same thing, so he crumples the letter, and it is found by Yamuna, who realizes his love. One day when they were walking together, Jeeva tries to remove the dirt from Yamuna’s eyes, and he kisses her. Yamuna is angry with him. Jeeva senses it and gets wet in the rain and gets a cold. Hearing this, Yamuna meets him. Jeeva expresses that she is the only medicine to him, and he needs her. Yamuna promises she will marry him. On Yamuna’s birthday, Jeeva jumps into her house and presents her a puppy. One day, fearing that Yamuna’s father might not marry him to Yamuna, he decides to marry her in a register office, but Yamuna refuses and Jeeva leaves.
Set in the year 1987, the movie depicts the life of Krishnakumar alias Kittu (Vishnu), a Dalit youth whose main ambition is to become a collector. He is influenced by the ideas of Chinnarasu (R. Parthiepan), a local Dalit leader who had also sponsored his education. Chinnarasu and Kittu try to fight against the rampant caste discrimination meted out to them by the upper caste people, but are unable to do much about it as the police and courts are biased towards the upper castes. One day, Kittu sees his classmate Gomathi (Sri Divya), who is from the upper caste, discriminate against a Dalit girl. He admonishes her publicly for her act of caste discrimination, which makes her repent her behaviour. Gomathi eventually falls in love with Kittu, but Kittu maintains a distance as they are from different castes, though he too is in love with her.
After the passing away of her parents in an automobile accident, Radhika moves in to live with her aunt, Malathi, and studies Zoology in Lexicon Science College. She is very friendly with Basu Subtankar and both, along with other girls, create quite a ruckus, much to the chagrin of their teachers and the College Principal. In addition to this, they are also staunch rivals of NRI Geetha Damodar, who wants to be the Student Chair. Radhika competes, there is a tie, but the teachers overturn Radhika’s votes due to many complaints against her, and elect Geetha as the Chair. When Malathi wants Radhika to wed, both girls create a fictional character, name him Ramesh, and tell Malathi that Radhika is in love with Ramesh. Complications arise when a real male named Ramesh surfaces, is subsequently killed, and the duo become suspects amidst a web of deceit and lies created by one of four persons in their lives, namely Malati herself, Geetha, a mysterious woman who sometimes poses as Ramesh’s mother and other times as Geetha’s guardian, and an fourth unknown person – leading the duo to a roller-coaster ride with both the police and the real killer on their tails.
Viswa (Dinesh) is a good for nothing guy who lives in a police colony and is son of an honest constable (Rajesh). It follows the conflict between a disciplinarian father and his wayward son. One day the constable dies in line of duty and the son gets his father’s job. The rest of the story is how Viswa becomes from a reluctant cop to a disciplined guy, who takes revenge against those who murdered his father.