Kaaliyan is a village president in the Madurai district, who is fondly called Annaatthe. His nieces compete with each other to marry him. But, he falls in love with another woman who visits their village. Kaaliyan has a sister who gets married and shifts to Kolkata where she faces some unknown threats. Soon, her brother comes to her aid.

A man is mistakenly suspected of being a threat to the President of India.

Set in the fictional dystopian city-state of Khansaar, the film follows the friendship between Deva, a tribesman, and Varadha, the prince of Khansaar. When a coup d'état is planned by his father's ministers and his relatives, Varadha enlists Deva's help to become Khansaar's undisputed ruler.