Deadman Wonderland
 

This is a forum for DW. For those who don't know, it was an anime released a few years ago that was adapted from a manga. If it wasn't for this anime, I wouldn't even know about the manga.
It centers around the survivor of a middle school class, Ganta Igarashi, who is then convicted and framed for this crime by his lawyer, who is really the promoter of Deadman Wonderland, the first private hybrid prison/amusement park. There, Ganta meets someone from his past, Shiro (no, not me), who was his best friend from his childhood. As he lives at DW, he learns that DW is connected to the murderer, the Wretched Egg or "Red Man". He then goes on to learn about the dark truth of this twisted Devil's Amusement Park....
It's a good anime, so if you haven't seen it, check it out.

I remember when this show aired on Toonami in 2012. Yeah, the manga is a good way to continue the series for those who like the anime, since from the best of my knowledge on the subject the anime didn't get picked up for a second season.

Yeah, I wish there was a second season. If I didn't read an Otaku USA article about it, I would never found out. It influenced a fanfic of mine heavily before I had to reboot it.
I think the reason they stopped making more episodes was because it never picked up in Japan, and they suffered a tsunami and didn't have the funds to order and create another season. I may be wrong.