Plot
The film starts with a serial killer (whose face is not revealed) stalking and filming a girl from outside her house and later at night suffocating her by wrapping her head in plastic and tying her hands behind her. He then drags her to an abandoned football field where he beheads her and sets her body on fire.
Later, the film focuses on Swapna, a single young woman and a talented game designer. She has a fear of darkness, and also has post-traumatic stress more so known as 'anniversary reaction', a condition which triggers unsettling feelings around the anniversary of a traumatic event. For Swapna, it is the horrific memory of her being raped in a dark room that happened on last New Year's Eve.
Her family has a traditional mindset that decent girls should not have tattoos or go out at night; to which she did not listen, and was later raped. Instead of comforting her afterwards, they kept blaming the tragedy on her and not listening to them. Because of this, she left her parents, never contacted them since, and leads a secluded life with Kalamma, her housemaid who stays with her. Her only solace is her love for gaming.
The new year is around the corner and Swapna suffers from PTSD a second time since last year after she has to enter a dark room, even with Kalamma being with her. She also feels a stinging pain in the tattoo area on her wrist from time to time. As her tattoo (of a game life) was a year old, the pain persisting even now seemed very unusual.
Before going to a doctor to treat it, Swapna meets Varsha, the tattoo artist whom she knows well, and asks her about it. Varsha nervously reveals that she made her tattoo with an ink mixed with a stranger's ashes by mistake, but later tried to contact her many times to inform her about it but wasn't able to get in touch with her. She profusely apologises and tries to assure her that it has nothing to do with the pain she feels, but Swapna angrily storms off and later that day books an appointment for laser removal of her tattoo, but she is not able to go through with it as the tattoo keeps stinging.
Later she goes to a nearby cafe to grab a coffee, but finds two men watching the video of her being raped. As she realises that the video has gone viral, she rushes out and back later at the hospital, she is told by Kalamma that her parents are coming to talk to her about the video. Swapna immediately walks to the balcony and jumps off, but is saved, although her legs are broken, and is now recovering on a wheelchair. Weeks later, on New Year's eve, a woman by the name of Dr. Reena arrives with Varsha at her home, and tells Swapna about her cheerful daughter Amutha, a three time cancer survivor and a social activist for cancer patients, who became an unfortunate victim of a serial killer. In her memory, she got the tattoo that Amutha wanted her to have, with the ink mixed with her ashes, which was also accidentally used by Varsha to make Swapna's tattoo. Reena comforts and encourages Swapna, saying that she feels her daughter is with her in the form of her tattoo and will want her to fight no matter what the outcome is.
Later that day, Swapna cancels her second tattoo removal appointment. Beginning to accept her past and feeling optimistic, she asks Kalamma for them to go meet her parents the next day (to which she had been deliberately putting off for the past few months), to Kalamma's glad surprise.
Meanwhile, the same serial killer that killed many young women in the city, including Amutha, finally targets Swapna. At night, he kills off the security guard and then Kalamma. Before he kills Swapna, she is shocked to see not one but three of the same tattoos on her wrist.
Swapna wakes up from the nightmare and immediately switches on the light, only to find that there are still two tattoos left on her wrist. Wanting to make sure it was all just a dream, she looks out the window with Kalamma to spot the security guard, but they are horrified to see his headless body on the ground. Fearing the same events about to happen, she calls the police ahead of time and waits for them with Kalamma inside her room, but they are forced to leave when someone sets the room on fire from outside her window. In the living room they see the killer waiting for them. He murders Kalamma but two police officers who had just arrived, are able to spot the killer from outside the window and shoot him. Outside the house, Swapna sees the curtain being closed by the killer inside. Assuming him to be still alive, Swapna alerts the officers. When one of them searches inside, he notices the body of the killer gone. He immediately orders his subordinate to take Swapna to the police station while he stays behind and calls for backup. As the vehicle is driving off, Swapna is shocked to see in the rear view mirror not one but three killers with the heads of the officer, Kalamma and the security guard, waving her goodbye with the hand of the previously dead killer sitting on her wheelchair. She looks behind and, to her horror, sees the vehicle on fire. She cries in vain to the officer to stop the car, just when it explodes.
Swapna awakes again from the nightmare with her last life remaining, only one tattoo. She struggles for a bit but doesn't switch the light on this time, finally overcoming her fear of darkness in the process, while the killers, who had just beheaded the security guard take their positions, one outside the front door, one outside her room window and one going to the terrace. Swapna first calls the police and then switches off the light of the whole house, which stops the killer outside her room window to record anything inside, confusing him. She and Kalamma then manage to burn the other killer going to the terrace to death, just as the police arrive. But, another killer on the terrace pushes Kalamma down the stairs, severely injuring her, while the two officers are killed by the killer outside the front door. Now in the living room, he targets Swapna, who had come to Kalamma's help lying on the bottom of the stairs, who, even in that condition, distracts the killer by stabbing him in the foot with a knife and give Swapna the hint, who takes out the footrest of her wheelchair and hits him on the head multiple times, killing him too. The third killer on the terrace now comes down and Swapna quickly drags herself to her room but the killer enters after her and shuts the door behind. He records Swapna with the video camera while holding a machete to her neck, but she is able to stab him in his neck with a broken piece of glass. Finally, with all the killers dead and Kalamma still alive, Swapna is overwhelmed with emotions just as the fireworks are set off in the sky for a new year.
