A mysterious Avenger turns up in the neighborhood. Driven by her strong longing for justice, she has made it her duty to eliminate every criminal, liar, and traitor in her area who is a threat to society and innocent individuals. After her deed is done, she begins to tell the tale of another Avenger, who seems to be in a similar situation but whose motives are a lot different:
Marissa's 18th birthday is coming up. Marissa and her guests spend a good time together, drinking and laughing. During this time, Marissa feels betrayed and she gets to know the truth about her friends. As they are getting drunk, they don't realize that Marissa can hear them, and she then realizes more and more how her friends are plotting behind her back. Marissa's mood changes. She begins to hate them and starts to take revenge.