The Plot is based on a movie named "Brewster's Millions" which is a 1985 comedy film starring Richard Pryor and John Candy which in fact is based on the 1902 novel of the same name[3] by George Barr McCutcheon.
Rajnikanth finds himself to be an orphan.

He travels from his village to Madras. There he meets Janakaraj, who gives him a job. By some magical situation, Rajni discovers himself to be a son of a dead millionaire—through Visu. Visu is the guardian of Rajni's father's trust. If Rajni wants his inheritance, he has to follow certain rules.

He can get an inheritance of 30 billion if he can spend 300 million in a month. The three conditions are: no contributions to charities, not to own any assets at the end of the month, and, above all, no one else must not know. If Rajni fails to spend the money according to the rules, all the money will go to his father's trust which is managed by V.K.Ramasamy, "Nizhalgal" Ravi, Kitty and Raghuvaran. These four form a team of "villains".

They want to spoil Rajni's efforts and get all the money for the trust and then to loot the money. Rambha is Visu's daughter and she is appointed as the accountant for Rajni for 30 days.

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