Hatred

From the introduction: Your name is not important. What is important is what you're going to do. You just fucking hate this world, and the human worms feasting on its carcass. Your whole life is just cold, bitter hatred, and you always wanted to die violently. This is the time of vengeance, and no life is worth saving. And you will put in the grave as many as you can. It's time for you to kill.