Anbu and Arun (Partibhan - Rehman) are bosom buddies with Anbu being indebted to the wealthy Arun for various reasons. Anbu falls in love with Kavita (Devayani), whose close friend is Kausalya (Kaveri).Arun soon develops a soft corner for Kausalya whom he had never seen. Her lofty thoughts expressed in her letters to Kavita,had attracted him to her. Kausalya reads his messages to her sent through Kavita`s letters and finds herself reciprocating to Arun`s feelings.Arun has a near fatal accident and expresses his last wish to see Kavita. Anbu goes to get her, only to find her killed at the hands of the jealous suitor (Prabhukant). With no way out, Anbu persuades Kavita to play Kausalya, so that his friend`s final wish can be fulfilled. But Arun comes out of the ordeal miraculously alive and Kavita finds herself trapped in a situation that causes her much heartburn. How the matter is resolved, with both the friends trying to play martyr, forms the rest of the story.
Parthiban depicts impressively the character of the friend who puts friendship above love and suffers the consequences in silence. Devayani brings out the helplessness of the character effectively. Some of Vadivelu`s comic escapades can be enjoyed. With the two hero subjects being the order of the day it is not surprising that most of the recently released films, have either a love triangle or friendship & sacrifice as its base.
`Ninaikkatha Naalillai` has both the love triangle and friendship factors weaved in. Neatly crafted in the first half, the film lags a little in the second, and picks up pace in the closing scenes.