A village head Arunachalam (Rajinikanth) who has two brothers
Saravanan (Raja), Shakthi, (Shakthi Kumar) and a sister Arundhati
(Anju Aravind) and a happy family. Ammayappa (Ravichandran) and K. R.
Vatsala are his parents. Vedavalli (Soundarya) is the daughter of
Aathikesavan (Jaishankar) and (Vennira Aadai Nirmala). Nirmala is
Ammayappa's sister and they all come to Ammayappa's home for
Arunachalam's sister's wedding. That gives the opportunity for
Vedavalli and Arunachalam to fight first, then fall in love with each
other.

Arunachalam finds himself to be an orphan by interval. He goes out of
the village. He goes to Madras where he meets Beeda Kathavarayan
(Janakaraj), who gives him a job. By some magical situation
Arunachalam discovers himself to be the son of India's richest (dead)
billionaire Vedhachalam (Rajinikanth) through Rangachari (Visu).
Rangachari is the guardian of Arunachalam's father's trust. If
Arunachalam wants his inheritance, he has to follow certain rules. He
can get an inheritance of 3000 Crore Rupees if he can spend 30 crores
in 30 days. The conditions are: no contributions to charities, not to
own any assets at the end of 30 days and above all, no one else should
know about this and receipts should be provide for all the expenses.
If Arunachalam fails to spend the money according to the rules, all
the money will go to his father's trust which is managed by Vishwanath
(Raghuvaran), Prathap (Nizhalgal Ravi), Kurian (Kitty) and
Kaliyaperumal (V. K. Ramasamy). These four form a team of "villains".
They want to spoil Arunachalam's efforts and get all the money for the
trust and kill Rangachari. Nandhini (Rambha) is Rangachari's daughter
and she is appointed as the accountant for Arunachalam for 30 days.

Arunachalam tries hard to spend his money and many times, the money
comes back. He spends on Horse races, lottery tickets, makes a movie
with Arivazhagan (Senthil) as the hero and he even starts his own
political party with Kathavarayan being the candidate. All these
events are good opportunities for situation comedies. Does Arunachalam
win this competition, does he get all the 3000 Crore rupees for
himself and live happily ever after is the rest of the story.