If you're not averse to animation, Death Note is precisely that. The protagonist is a high-school student/prodigy named Light Yagami, who has grown cynical with the state of the world and all the crime within it. Outside his classroom window, he notices a notebook falling from the rooftop, and when he checks it out after class, he finds that it's no ordinary notebook--called the Death Note, it claims that anyone who writes a person's name while imagining their face will cause that person to die in any realistic manner they desire (or, if just the name is written or the cause of death is unrealistic, via heart attack after 40 seconds).
At first skeptical, Light tries it out on a criminal he sees on a live news feed, and when the man is reported dead less than a minute later, he finds more such criminals and tests it on them, too (with the same results). Around this time, Light notices a strange demon-looking creature in his room who introduces himself as Ryuk. Ryuk is a death god (or "shinigami") and he claims that he momentarily lost his Death Note, but now that Light's found it, he can see Ryuk and can use the Death Note as he pleases, with Ryuk only there to provide additional information. Light then proclaims that his goal is to use the Death Note in order to wipe out the world's criminals, in order to create a utopia where there is no evil, placing himself at the top ("And I...I will become the god of this new world!").
It doesn't take long, however, for law enforcement to catch onto the fact that, overnight, hundreds of perfectly-healthy criminals have just dropped over dead. The news reaches all the way to the United Nations, who have commissioned a world-famous detective known only as "L" to track down and apprehend this threat. Even though he targets only criminals, this invisible worldwide killer known as "Kira" (a.k.a. our good buddy Light) represents the death of free will and the runaway menace of vigilante justice, and L believes he must be stopped at any cost.
The TV series is 37 episodes long, and while episodes 26-36 aren't exactly spectacular (especially compared to the episodes that came before), it's very much worth it to see the climax and how it all goes down. But it's a thriller, specifically a cat-and-mouse type, and the main character is definitely an anti-hero operating by his own method of justice, so it's right up your alley. As I said, as long as you can get over the fact that it's animated, you should check it out.