Lesa Lesa story is all set in a hill station (Ooty) where a rich man comes with his five grand daughters (four of them are Mumbai models) for vacation. The fifth girl (Trisha) is very smart, and she is the favourite of the grandfather. But she has some secret, which nobody knows.
The girls meet two guys, one of them their own cousin who are their neighbours and they all play pranks on them. One of them (Shaam) falls in love with Trisha, but she shocks him, by telling him that she has a husband (Madhavan) who is in jail. This forms the climax of the film.