The film opens to Gautham Prabhakar (Vijay) searching all around Pondicherry in vain for a girl named Gayathri. He encounters a group of friends headed by Hema (Shalini) and requests their help in locating Gayathri (Kaveri), who appears to be Gautham's lover. The group members are initially hostile to him but eventually decide to help him after Gautham pursues them aggressively and Hema realizes that he may be suffering from a neurological condition resulting in amnesia and delusions. Hema's father Dr. Rajashekar (Raghuvaran) is a psychiatrist who discovers Gautham's real condition and the dangers it poses.