Five IT employees—Santhosh aka "Sandy", Joe, Gokul, Vaishnavi, and Nikita Ashwathy Warrier—spend a weekend in the Chandragiri forest, where they meet a siddhar who claims the power to grant wishes. The skeptic in Sandy is soon surprised when the siddhar grants a peculiar request: a copy of the Daily Thanthi dated the day after Ayudha Puja, a time when newspapers aren’t printed. To their astonishment, the requested newspaper materializes before them. As the group pores over it, they stumble on a startling headline about their employer, Satyam Computers, supposedly closing down the very next day. When the predicted shutdown comes true, they race to validate the miracle and quickly sense a strange opportunity to profit from it.
Vaishnavi is the first to notice a sensational detail: an article about a boxer named Peter Sivakarthikeyan who supposedly wins the Ayudha Puja tournament and dedicates ₹2,00,00,000 to the five of them. Spurred by the possibility of a windfall, the IT gang tracks down Peter, a laid-back young man who spends time with his best friend Neruppu Kumar Arunraja Kamaraj. Peter harbors a soft spot for Yazhini Sethuraman, a sports buff, and to win her heart he agrees to enter the boxing tournament even though training doesn’t come naturally to him. Yazhini Hansika Motwani admires his earnestness, and the unlikely alliance pushes Peter further into the contest.
Their optimism is challenged when they learn of another boxer named Peter, famously known as "Peter the Killer," a fifteen-time champion who resists any overture from outsiders. The IT team approaches Killer Peter but is rebuffed. Undeterred, they persevere with their original Peter. As the tournament unfolds, Peter manages to advance through the early rounds—often by fluke—earning media attention and a nickname that dots the line between belief and surprise: "Maan Karate". The public begins to split its opinion, distinguishing between this unexpected contender and the seasoned veteran, Killer Peter.
The final heats intensify, pitting Peter against Killer Peter. He fears the dangerous outcome of facing a veteran and also worries Yazhini’s reaction if she discovers he isn’t a trained boxer. He even contemplates persuading Killer Peter to throw the match, but the heavyweight refuses. In a twist, the IT gang wavers, tempted by a substantial sum of ₹75,00,000, and hedges their bets with Killer Peter’s camp. Despite the shifting loyalties, Peter refuses to back down and makes every possible effort to secure the win.
On Ayudha Puja day, the final is a high-stakes duel. Killer Peter takes an early lead, but Peter fights with rising resolve, bolstered by Yazhini’s faith in him. In a defining moment, Peter defeats Killer Peter, claiming the tournament trophy and the ₹2,00,00,000 prize. He publicly proclaims his love for Yazhini, a gesture that resonates with the crowd and the audience watching the spectacle unfold. The IT gang, moved by the spectacle yet wary of the cost, declines the offer to share the prize and retreat to their own concerns.
The film closes with a symbolic callback to the siddhar’s intervention. A torn fragment of the newspaper—once materialized and left in Chandragiri forest months earlier—is rediscovered, bearing a photo of the Maan Karate Peter lifting the trophy. The image lingers as a quiet reminder that wishes can alter fate in unexpected ways, weaving together ambition, luck, and love in a story that balances humor with heartfelt moments.
