After the arrival of a few thieves home, Mindy looks as they arrive and destroy his house, and his father attacked him, thinks that they are looking for anything special, but it is not, go to his father, tied it against a Chair in the dining room and her sit her in a brutal way opposite to the so that he could see how they burned her father alive while they laughed and while Mindy was dying inside to see such tragedy...The bad guys go home and leave everything in silence as if nothing had happened, Marcus the best friend of his father knocks on the door, but Mindy is trapped between those knots of rope that tied it, is only to scream, and fortunately Marcus listens, goes into breaking the door and feeling the heat of the fire, because I'm consuming in your friend Mindy without a drop of tears in his eyes ask you unleash it to soon make revenge of the death of his father...To attend school for the first time, after being educated at home, enters and meets personalities million since it is a world that is new for her, but nothing terrifying instead develops very well within the classes always taking good notes, on the other hand there is a nerd boy, sexy, but very shy with girls that nobody wants as a friend because he is a weakling and have friends that as they are not "popular".Meet Mindy, and she treats it like a normal person, but that she is very silly, she is not interested in the popularity or things of girls as the rest of their classes that are so obsessed with boys and handsome boys, she bands what passionate is to defeat all the villains, weapons , martial arts, speed, danger, etc., but primarily prepare to find the damned who killed his father in front of it.

The nerd Lizewski also excite you overcome the crime and be a superhero, to overcome also to the brabucones that bother you, Hit-girl was already a masked superhero without identity in the society, but in real life was Mindy the girl who was looking for overcoming evil, Lizewski discovers his identity and decide that you want to learn how to be like her together and avenge the death of the father of Mindy. (HIT-GIRL). The training begins and Lizewski decides to be appointed as KICK-ASS, doing honor to your name every day learn to pull with weapons, to beat the thieves to kill people who do evil to a society and to have control of their strength. Together at Last achieved the triumph to the face to face with RED MIST, who is responsible for killing the father of Mindy to discover that he was the one who kept a antidote to be indestructible before any danger. They find, they are in a fight but he is not only, along with the other wicked people in the story are fighting against them while leaving them serious injury and Mindy leaving her unconscious after a fatal blow to one of the ill. Then get the antidote and it is injected in order to overcome the evil red mist, which with fortune - achieves and kick-ass also. Winning this battle… Hit-girl and kick-ass decide to pool their forces and be best friends forever.