The protagonist, whose name is not mentioned, is revealed to be a care free MBA student and bike enthusiast, accompanied by his close friends Mahesh, Shyam, Srikanth and Auto Selvam. He has two sisters and two love stories that revolved around him in the past, one is Sukanya, and the other, Mallika. He now considers his new bike, Thunderbird, as his first love ever. However, he meets and falls in love with Leela, a friend of his sister, Maythrie, who stays in his house to complete her studies. He plans a long road trip in his bike to Kanyakumari along with his friend Mahesh, but he ditches his friend in the last minute and is accompanied by Leela instead.

They head to Kanyakumari via Salem, Palakkad, and Trivandrum. The protagonist also humorously finds out about Leela's gluttony, over food. On the trip, they go to a village and stay for a night, where they are taken care by a kind-hearted villager. The next day, they reach Kanyakumari and see the sunrise. During the course of the trip, Leela falls for him. After the trip, he agrees to drop her at her home, in Kolhapur. On their way to Maharashtra, they meet with a road accident. The protagonist injures his shoulder and proposes to her, before fainting, as if he was about to die. The next day he wakes up to find himself in a hospital. He feels that something is wrong after phoning Leela.

The same day, Leela's parents are attacked by some unknown assailants. The protagonist and his friend, Mahesh, visit the hospital that Leela and her parents are in. The three of them discover that Leela was the target of the attack. The protagonist decides to save Leela. But they encounter a corrupt cop, Kamath, who, with a help of a gangster, Hiren, kill Leela's parents. Unfortunately, Mahesh is also killed in the incident. The protagonist is devastated by this and vows to avenge Mahesh and Leela's parents's death at any cost. Leela and the protagonist go into hiding, where Kamath tries to trace them out, even in Mahesh's funeral. Kamath finally reaches his house, in Chennai, where another friend of the protagonist, poses as the owner of his bike, with fake proof.

Deceived, Kamath returns to Maharashtra. Two years later, Kamath is preparing to receive his new superior police officer, in Kolhapur. The new officer is none other than the protagonist himself; he is now the new DCP of Kolhapur, who went into a self-imposed exile, studied for the UPSC exam, and chose IPS, despite being eligible for IAS, to fulfill his vengeance. Finally, his name is revealed to be 'Rajinikanth Muralitharan'. He also reveals the reason behind hiding his name so far; his mother, being a big fan of Rajinikanth, without any hesitations, named him so, as soon as he was born. Whenever anybody came to know of his name, they would look at him for an extra few seconds, which is why, he seldom states his name to others.

Rajini then reveals that he has unravelled what happened two years ago to Kamath. Leela's biological father, Nathuram Dubey, is a politician in Maharashtra, and the candidate for Chief Minister of Maharashtra. He planned to kill Leela as she was his illegitimate daughter and thus, a danger to his political ambitions. Kamath, with the help of Hiren, executed his plan. Rajini discovered that Leela's actual mother, Anamika, knew of the incident. After his probation, Rajini devised a plan to eliminate everyone involved in the scheme. Nathuram is arrested and brought into the station. Kamath, defeated, tries to kill Rajini, but accidentally shoots Nathuram. Finally, Rajini assassinates Kamath, in self-defense, avenging Mahesh' and Leela's parents' deaths. He gets a vacation, based on personal trauma, and returns home. He picks up Leela from the village they stayed in, on their way to Kanyakumari. Later, they both go on a bike trip to Kanyakumari, again, only for Rajini to propose to Leela.