It is the story of a kind-hearted playful young man (Vijay). Unable to withstand his pranks his father drives him out of his home. He goes about his life doing odd jobs but never lasts longer than few days in one place. He meets a girl with dreamy eyes (Rajini) but pretends to a half-witted boy (Munna) to win her heart. Meanwhile some cops are chasing a diamond thief (Raja Babu) who hides the diamond in Munna's hip pocket. Rest of the plot revolves around how Raja Babu tries to retrieve his diamond, how successful Munna and Rajini are in getting rid of the bad guys.A diamond thief hides his loot on an innocent child, but the child turns out to be an adult posing as a youngster to purchase a half-priced train ticket. Now, the thief will have to outwit the eccentric in a series of wacky misadventures.