Deadman Wonderland

I in no way own the anime, Deadman Wonderland.

To start out, this anime is weird. A normal boy, Igarashi Ganta, is in middle-school talking with his friends, when suddenly, a man dressed in red clothing rips apart his classroom wall, flys in, and slaughters his entire class. But, instead of killing Ganta, he imbeds a hellish looking crystal into his chest. Later in the anime, you find out what this crystal does, and why, named by Ganta, The Red Man did this. Following a short trial, Ganta is convicted for the brutal massacre of his class and sent to a prison, named Deadman Wonderland. Deadman Wonderland is a themeparkesque prison, where honest members of society can come and watch these prisoners do various things.

Though.. it.. SUCKED in the end. It seems like... it got canceled half way through, and they rushed the story to it's ending. But it's definitely worth watching.