Mahesh (Vidharth) is a thug in Thanjavur whose only ambition is to emerge as the Number 1 rowdy with his name topping the list of wanted criminals in the local police station. He is called 'Yamakunji' (junior lord of dead) by his friends, for he wants to send fear in the spine of his opponents. He indulges in all unlawful activities to achieve his mission. For his mother (Kalairani), he is the best son on earth. She earns her livelihood running an idly shop. Mahesh meets Mythili (Kavitha Nair), a school student and daughter of a bus conductor Ponnusamy (Ilavarasu). Mythili falls for him; however, Ponnusamy opposes their affair. Things take a turn when Karuppu Balu (Kishore), the number one rowdy in the area, comes out of jail. Mahesh incurs the wrath of the aspiring MLA for no fault of his. Things take a turn when Mythili elopes from her house and Mahesh is forced to kill Balu. The movie ends with a strong message.