Chitra Aravindhan, along with his three friends, Aarthi, Thambesh, and Harish, runs a YouTube channel called “Barking Dogs” in Chennai. They focus on creating parodies and political satires, which garner them lakhs of views. However, when a young lady dies by suicide, the team discovers that corrupt officials caused her death. In response, they protest, demanding justice. The police arrest them, but they eventually get bailed out by Chitra’s girlfriend, Disha. She lectures them that they cannot single-handedly change the country. Soon, they launch a campaign titled “Come Back Indian,” believing that only Senapathy, alias “Indian Thatha” (transl. grandfather), can put an end to the corruption once and for all.

Nilesh, one of Chitra’s friends, spots Senapathy in Taipei and discovers that he is running a martial arts school there, teaching Varma Kalai. Nilesh persuades him to return to Chennai, which he eventually does, by using his senior mentor’s passport. CBI officers Pramod and Elango attempt to capture Senapathy upon his arrival in India but fail. Senapathy initially starts targeting corrupt individuals in Gujarat and Odisha. Then, he urges his followers and the public to expose corrupt individuals in their respective states through peaceful means, inspired by Gandhi’s principles, while he will uphold the ideals of Subhas Chandra Bose. He emphasises that people should prioritise addressing corruption at home before tackling external issues. Senapathy also tearfully mentions that he had killed his own son, Chandrabose “Chandru”, in 1996 as he too was a part of the corruption in the country back then and was directly responsible for the deaths of 40 school children due to a brake fault in their school bus. This results in everyone getting motivated; Chitra and his friends then start monitoring their parents’ activities to uncover any wrongdoing. Harish visits his uncle’s motel and discovers they serve stale food to customers. Thambesh finds out that his brother-in-law, Nanjunda Moorthy, accepts bribes from customers, as does Aarthi’s mother, Kanagalatha. They report their findings to the Anti-Corruption Vigilance Team (ACVT), leading to their parents’ arrest.