Ganta is the only survivor after a mysterious man in red slaughters a classroom full of teenagers. He's framed for the carnage, sentenced to die, and locked away in the most twisted prison ever built: Deadman Wonderland. And then it gets worse.
This tv show contains 29 potentially triggering events.
In episodes 11-12 of the anime two women, one of whom is a minor, are threatened with gang rape.
Also another character's backstory is how she was raped by her father, and the aftermath is shown on the screen.
Almost all of the characters are implied to be mentally ill and are violent. A character with Dissociative Identity Disorder has an alter that is a murderer/the main antagonist. Many of the characters have some form of PTSD and some are either forced into violence or end up being violent because of their trauma.