Ghilli movie is all about Ghilli who is the nickname for the popular state level kabbadi player Velu (Vijay). His father Sivasubramanian (Ashish Vidyarti) is an assistant police commissioner , is a martinet who finds his son (who still has his arrears to clear before he gets his degree) incorrigible. His mother (Janaki Sabesh), on the other hand, dotes on him. His younger sister Bhuvana (`Baby' Jennifer) who is the typical sharp and inquisitive schoolgirl. Velu goes to Madurai for a kabbadi match.