The film opens with a bully fight between two individuals on a rainy night in a deep, dark forest. In the opening scene, a title card is presented with a Upanishad quote: “Death is just the beginning of another life”.
Karthik (Arya) is a young happy-go-lucky carefree architect, who, one day, comes across a young beautiful girl, Sandhya (Trisha Krishnan) in a go-karting race. Karthik immediately falls in love with Sandhya and wants to convince her to marry him. Sandhya is a pediatric doctor due to her love for children. Karthik finds out several pieces of information about her, and arranges a meeting by pretending that she had caused a car accident and damaged his car. When that approach fails, he goes to the hospital, where Sandhya works, becoming a regular visitor there and making efforts to woo her. Sandhya, however, has other interests and shows no signs of reciprocating his love. She believes Karthik is too carefree and not serious about life. He keeps following her and trying to convince her. One day, Sandhya’s parents tell her about her to-be-fixed marriage. She finally recognizes that Karthik is apparently the right match, and slowly develops a deep love for him. She wholeheartedly agrees with the marriage.

Arjun Krishna (Vikram Prabhu), a technician in a Chennai-based BMW showroom, meets Anamika Raghunath (Priya Anand), a college student, while out with her friends at Hard Rock Cafe. They are attracted to each other and go on a date the following night. Following the date, Anamika invites Arjun to her apartment for a bottle of vodka. Things go well until Anamika gets kidnapped by two men. Arjun, who was in the bathroom when Anamika was kidnapped, immediately lodges a complaint at the Besant Nagar police station. Sub-Inspector Arumugam (M. S. Baskar), who is assigned the case, then goes to Anamika’s apartment along with Arjun, but finds that the apartment is cleaned up and there seems to be no sign that a kidnapping has taken place, while the apartment’s watchman insists that Anamika had not returned to her apartment for three days. Also, the CCTV camera installed at the apartment does not show any men arriving and taking away Anamika, prompting Arumugam to suspect that Arjun has lodged a false complaint as he is drunk. However, when Arumugam calls up Anamika’s father Raghunath Kumar (Shankar Sundaram), the chairman of the TV news channel Channel 24, he merely replies that he doesn’t know anything about the kidnapping and that Anamika is holidaying in Goa, at which Arumugam suspects something amiss, realising that Arjun had not lied after all. Arumugam and Arjun rush to Raghunath’s mansion, where they see him being threatened by the two men who had kidnapped Anamika as well as the police inspector of Besant Nagar to give them a SD card which has some critical information. Raghunath calls up his editor and asks him to give the SD card to the three men, after which he is killed by them. Arjun and Arumugam pursue the three men. While Arjun manages to kill the police inspector, the other two men escape, killing Arumugam in the process.

After their wedlock, Bala and Priya encounter supernatural occurring that relates Priya and her dead mother’s mental condition. A man with a special power intersects the lives of the distressed couple lights upon a haunting threat while bearing witness to a divine phenomenon that will change the world.