Poor Ganta never knew what happened. When he looked out of the window to his classroom he didn't expect to see a red man floating there. The next moment he was stood in the middle of a blood bath.
Tried & charged with the murder of all his classmates, Ganta was given the death sentence, but his prison isn't any regular jail. The Deadman Wonderland is more or an amusement park where prisoners compete for their lives. There he has a tough time standing up for himself, but still manages to make friends. But in a place that kills people as entertainment, nothing is as it seems. Just who can Ganta really trust? Will justice ever be served?