Akira Sharma (Sonakshi Sinha) is a little girl in a small town who lives happily with her father and mother. One day, she witnesses a crime involving a group of unruly men ruthlessly throwing acid on a young woman's face. Akira helps police to catch the criminal, but the accomplices of the criminal swear vengeance. Akira's father realizes the importance of self-defence and enrols her in a self-defence class. One day on her way to home, Akira notices gang members who scared her tease another girl. She beats them up, but one of them takes out a bottle of acid to throw acid on Akira. When it backfires on him, Akira is accused of throwing acid on his face and is sent to juvenile jail.

Fourteen years later, Akira has grown into a brave and headstrong young woman, but her father has died. Akira and her mom move in with her brother, who she hates because he left them to marry. Akira joins Holy Cross College and lives in a hostel, as her mom decides to stay back with her brother while taking care of his child. A couple of students tries to bully her but ends up learning the hard way to not mess with her. One night, an inspector runs into one of the college professors with his car and beats him up because the professor is upset about the policeman's behaviour. The college students reach out to the commissioner with the aid of a strike. The police brutally beat them up and try to move all of the students away; only Akira remains. She hands over the signed petition sheet and the information to the commissioner when he arrives.

A couple of days later, the same policeman who hit the professor robs and kills a man. When he admits this on the phone at his girlfriend's place, she records his confession and decides to show it to her friends. At the last moment, her camera with all the information is stolen, and someone blackmails the policeman. All this makes the inspector nervous; he kills his girlfriend and begins researching who is behind this. This case is handled by ACP Rabiya because she knows it was a murder and not a suicide. One day, Akira finds a bag full of stolen items, including the camera, in front of her dorm. The policemen see her and take her away and decide to kill her. She sees three of the policemen kill two other men. The main ACP calls them and tells them they have the wrong girl, but because she saw everything to just shoot her. She escapes, goes to her principal, and tells him everything that has happened. He tells her he would love to help her but can only in the morning.

Suddenly, the cops take her away, and, with the help of a doctor, they give her shocks and injection in order to prove to the world that she is mentally unstable. She flees from the hospital with the help of another patient, Rani. She decides to prove her innocence but can only do so if one of the policemen speaks up. She kidnaps one, but she is caught by ACP himself. They try to kill her, but ACP Rabiya saves her. Rabiya is immediately stopped by the commissionaire because the ACP can help them in the future. She has to let the case go and leave but tells Akira that everything will be OK, though she cannot save her to too many problems. Akira kills all of those corrupt inspectors but still goes to the mental hospital to be proven mentally unstable when it occurs. She is released three months later. Akira decides to follow her dad’s footsteps by helping other kids.