The film opens amidst the chaos of Kolkata, showcasing a series of gruesome murders targeting local goons. DSP Ranabir Roy, a stern and formidable police officer, apprehends the killer after witnessing him commit these heinous acts. During the interrogation, he confronts Bijoy, the vengeful man behind these murders, calling him a "criminal." This provokes Bijoy, leading him to recount the harrowing events that shaped his fate.
Flashback: Bijoy arrives in Kolkata, intent on providing a better education for his younger brother, Raju. However, they quickly become embroiled in the political turmoil of the area, where they witness Bablu Koley, a local terror and opposition party leader, brutally kill a passerby in front of an onlooking crowd. The ensuing chaos draws the attention of the police, who mistakenly apprehend several innocent bystanders, including Bijoy and Raju. They witness Satyabrata Roy, a respected Human Rights lawyer, as he arrives to offer support. Satyabrata takes Bijoy and Raju under his wing, providing them refuge in his home.
With a newfound sense of normalcy, Bijoy begins working as a taxi driver, while Puja, Satyabrata’s daughter and a school teacher, helps enroll Raju in her school. Their lives begin to intertwine, and a romantic bond blossoms between Bijoy and Puja. However, tensions arise when Bindu Mashi, a candidate from the ruling party, comes into conflict with Satyabrata, making requests to drop the legal case against her. Mashi's refusal leads to tragedy, as she murders Satyabrata in an act of desperation, witnessed by Raju.
With danger encroaching, Mashi dispatches her henchmen to eliminate Raju, while Bablu also aims to use him as leverage against Mashi. Following the advice of Puja and her mother, Bijoy attempts to return Raju to their village. However, an explosive confrontation unfolds at the railway station, resulting in Raju being shot amidst a gang war.
Bijoy’s admission to Ranabir that only someone like him can eradicate such societal threats gains the officer’s admiration. Released from police custody, Bijoy plans his revenge, knowing that more lives like Raju's hang in the balance. As the city braces for a fierce election campaign between Bablu and Mashi, Bijoy becomes embroiled in their rivalry. He gains notoriety for settling scores against goons who prey on the innocent.
As election day arrives, Ranabir finds himself managing difficult situations at the polling booths, encountering Munna, Mashi's enforcer, who resorts to violence and intimidation. When Puja stands her ground against Munna during the voting, a physical confrontation ensues. Bijoy intervenes, unleashing his furious rage on Munna and cementing his reputation as a protector.
Meanwhile, Bindu Mashi retaliates by plotting against Bijoy, threatening Puja, which only amplifies Bijoy's desire for vengeance. He finds himself in a dangerous dance with the local political elite, as corrupt minister Binoy Samanta. Facing betrayals from every side, Bijoy's bravery shines as he stands resolute against these forces, ultimately leading to intense confrontations with both Mashi and Bablu, who conspire to destroy him.
However, Bijoy faces dire circumstances when he is captured and disposed of, only to be rescued by compassionate citizens. Eventually, he marries Puja, seeking some semblance of hope for a better future. Yet, the cycle of violence cannot be escaped, as he steps onto the political battlefield once more.
As Bijoy confronts Bablu and Mashi, he does so with a sense of purpose, showcasing his determination to eradicate the criminals plaguing Kolkata. This leads to a tense showdown that culminates in shocking confrontations, ultimately drenching the streets in violence yet again. With his enemies vanquished, Bijoy grapples with the implications of his actions.
Through heart-stopping moments and moral complexities, Bijoy faces a choice: to flee the city to protect his family or to stay and honor his brother's memory. In the end, he resolves to remain, buoyed by the vision of Raju, vowing to build a brighter future despite the darkness looming over them.
