The plot follows Karikalan, who is on a journey to find his birth identity, having been raised not knowing about anything about his parents. He goes to the Vengi kingdom and accidently meets Niranchana Devi, where he learns about the horrifying political clutches surrounding her and her first younger brother, Rajaraja Narendra. Vengi King Vimaladithyan has three children from his three wives, eldest daughter Niranchana of, first son Rajaraja Narendra of Kundavai - sister of Chola Emperor Rajendra Cholan I, second son Vishnuvarshan of - sister of Jayasimha II. Vengi is under undeclared war between the Niranchana, who want to strengthen throne for Rajaraja Narendra, and the Jayasimha II, who want to swipe elder & have a strong hold at Vengi with his nephew Vishnuvarshan, so as to stop & oppose chola invasion & dominance. Karikalan decides to dedicate for Niranchana and her mission. On his journey to save Niranchana Devi & to get his own identity he was put into positions to manage & tackle by-the-times most dangerous & intelligent men like Brammaraayar, Jayasimha II, Araiyan Rajarajan. In time, they eventually fall for one another
Their story spreads far from Vengi, and takes Karikalan to his guardian father figure - Araiyan Rajarajan, who is, along with other key members, bounded by an oath to not reveal Karikalan's identity under any circumstances. Even though Karikalan was not able to learn about his identity, he was treated as a great warrior and due to his wit and intelligence, and quickly recieves a position in the War Council, which is headed by Vallavaraiyan Vandiyadevan for the Ganges Expedition of Cholas.
Karikalan's analytical and logical skills, his wit, and his quick intelligence assist Araiyan Rajarajan in devising war strategies in Cholas to win war and traverse kingdoms with minimum effort and loss, including taking Rajaraja Narendra from throne of Vengi. This brings the hatred of Niranchana towards Karikalan.
At end of Ottara war, its King Prathapaduran, one of the oath keepers, who broke it to Karikalan [...to be continued]
