India Pakistan is a story of how two young advocates Karthik (Vijay Antony) and Melina (Sushma Raj) counter lots of fights and fun together. Living in rented rooms in the same building, they lock up each other, fight, hide in each other's study, and sneak out each other's cases, trying to prove they are a better advocate than the other. They travel from place to place, regarding a village dispute case. In the end Melina decides to encounter the villain for the sake of two young lovers of the village. Karthik and his friends save her by playing a tactful game with the villain, who claims a DVD in which an encounter is shot. Karthik, Melina, and the others solve the mystery and unite when they confess their love for each other.