The movie opens with a tense scene where Thirumeni, played by <actor name>, enters a house wielding a pickaxe in search of a woman named Subbu. This chilling opening sets the tone for a story filled with psychological struggles, violence, and complex relationships.
Flashback to a year earlier, revealing Thiru’s daily life. He works as a food delivery boy for Meal Monkey, struggling through his routine while sharing a cramped room with his loyal friends, Pothi and Bhaskar. Thiru's world begins to unravel when a simple delivery turns sinister. He is asked to go to the 13th floor of a building, a detail that seems insignificant at first. He climbs the stairs, only to be met with hostility from the customer over a refund dispute for 2000₹. An unexpected act of violence occurs when Thiru, overwhelmed, kills the customer with a sangu (knife).
In the following scene, Thiru's life takes a dark turn as he sees a chocolate advertisement on television—an image that sparks a furious outburst, leading him to break the TV in anger. His friends scold him, but this outburst hints at deeper psychological issues. It is later revealed that Thiru suffers from Obsessive-Compulsive Disorder (OCD), a condition that significantly impacts his perception and actions. To deal with his mental health, Thiru begins therapy with a psychiatrist. Strangely, the incident with the customer on the 13th floor was a hallucination, meaning he never actually committed the murder. Nevertheless, this event leaves a lasting impression on Thiru’s fragile mind.
When Thiru returns home, his friends and roommate Pothi and Bhaskar confront him about his hospitalization. Thiru admits that he frequently feels an intense urge to harm others, confessing that in his imagination, he has killed Pothi a hundred times and Bhaskar a thousand times. This disclosure terrifies his friends, who decide to sleep outside his room for safety.
Thiru's work at Meal Monkey suffers, and his ratings plummet, leading to his account being blocked. Despite this setback, Pothi pleads with the manager to give Thiru one last chance. One night, during a delivery, Thiru encounters a girl named Subbu, played by <actor name>. Although she does not open the gate initially, Thiru, captivated by her, makes intricate plans to see her face. He packs her food in a large parcel to ensure she will open the gate, and his persistence pays off. He is drawn to Subbu, who works as a maid for a woman named Mangayarkarasi. Thiru begins following her secretly and learns about her difficult life, which involves frequent scolding and abuse from her employer.
Eventually, Subbu confesses to Thiru that she is ashamed to reveal she's a maid, but Thiru had already guessed this truth. As their relationship blossoms, they become lovers. However, their happiness is short-lived; Mangayarkarasi is caught checking Subbu's bag and her body—an act that exposes her harsh treatment. Subbu, overwhelmed and distressed, cries out and even lifts her clothes in frustration. Thirumeni witnesses this scene from a window and, filled with anger, vows that he wants to kill Mangayarkarasi.
As their bond deepens, Thiru and Subbu discuss her family problems, which leads to a heartfelt hug—an intimate moment that Mangayarkarasi sees. This sparks a fierce argument between the two, and Thiru leaves in agitation. Later, Subbu calls Thiru, and they attempt to take Mangayarkarasi to the hospital. Tragically, it's revealed that she has already died from poisoning. Her children, Aji and Anitha, are devastated and grief-stricken. When Subbu tries to contact Aji, he ignores her, so the couple places her body in a private mortuary, using Mangayarkarasi’s debit card to cover the expenses.
In a twist, Pothi is involved in an accident, but Thiru rescues him and loans money to cover hospital bills—using the stolen debit card. When Subbu learns her brother has swiped two lakhs, she becomes desperate to gather more funds by borrowing from friends. Meanwhile, Aji and Anitha, discovering their mother’s death, arrive at Subbu's house with intent to confront her. Their families visit, revealing their anger, and the situation escalates when they realize Mangayarkarasi died from poisoning—a fact that shocks everyone.
Thiru and Subbu are detained and questioned by the police. While in custody, Aji draws his gun, and chaos ensues. A corrupt police officer, bribed by the family, helps them escape, fueling the suspicion that the case might be manipulated. The police interrogate Thiru aggressively, and Subbu begins to believe Thiru could be the murderer, especially after an officer suggests his mental illness might be linked to the crime. This puts Thiru under tremendous pressure, and the police tortures him, even revealing a note where Thiru repeatedly writes that the taste of chocolate is bitter, a clue tied to his troubled memories.
The story flashes back to Thiru’s childhood—a time of happiness with his father, who works in a modest store earning a mere 500₹. Thiru’s father promises to buy him chocolate for his birthday, but tragedy strikes when he is beaten and humiliated by the store owner and police after a false theft accusation. Despite injuries and humiliation, his father manages to give Thiru the chocolate, covered in his own blood, and that becomes a symbol of deep love and sacrifice for Thiru. Tragically, Thiru’s father dies of suffocation that night, leaving behind a young Thiru with a profound sense of loss. Thiru later hallucinates throwing a stone at the store owner, an act he never actually commits, which signifies his internal struggle with trauma.
Returning to the present, Thiru boldly confesses to the police that he killed Mangayarkarasi. Among the evidence is a letter she wrote, revealing that she herself chose to end her life by taking sleeping pills, due to her feelings of abandonment by her children, Aji and Anitha. The revelation clears Thiru’s name, and he and Subbu are finally released from jail. However, the emotional toll has left them changed forever. Subbu, feeling responsible for Thiru’s actions, asks for forgiveness, but Thiru, deeply affected, simply walks away.
As the story unfolds, Aji and Anitha conspire to take control of their mother’s house in America, with Aji’s uncle providing funds. Meanwhile, Thiru, devastated, finds his belongings thrown out and notices a damaged photo of his father. Subbu discovers that the family is trying to force her to sign over the house, and she decides to leave, unwilling to go to the United States.
Thiru, now overwhelmed with grief and rage, confronts his struggles yet again. He finds Bhaskar dead—struck by the television—symbolizing the ongoing cycle of tragedy. Thiru then takes Bhaskar’s bike and rides to the Meal Monkey office, where he commits an act of violence by killing the company owner. The story takes a darker turn as Aji, Anitha, and their relatives terrorize Subbu. When Thiru arrives, his anger reaches its peak, and he kills Aji, Anitha, and their uncle in a violent outburst.
In the climax, Thiru faces Subbu, who begs him to kill her—feeling herself responsible for his descent into violence. Thiru, however, shows compassion, dropping his weapon and expressing love for her hands in a heartfelt moment. He believes that forgiveness and love are paramount, echoing the idea that if someone truly forgives, they are still human, but if they don't, they might have become something far worse.
As he steps outside, Thiru experiences a haunting hallucination—seeing his father riding a bicycle. He asks him why his clothes are dirty, and Thiru’s father calmly explains that it’s just for play. In a tender voice, Thiru’s father reassures him, telling him that his name—Thiru—means "pure", both spiritually and physically. This touching scene serves as a reflection on innocence lost, trauma endured, and the yearning for peace amid chaos.
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