Deadman Wonderland

Deadman Wonderland (デッドマンワンダーランド, Deddoman Wandārando) is a manga series written by Jinsei Kataoka and illustrated by Kazuma Kondou, who also wrote and illustrated the Eureka Seven manga, and published in Shōnen Ace since 2007. Tokyopop acquired the licensing rights to distribute the manga in English and has released the first volume on February 9, 2010. An anime adaptation began airing in April 2011.

Story
Prior to the start of the story, a massive earthquake ravaged Japan's mainland and destroyed most of Tokyo, sinking three-quarters of it into the ocean. Ten years later, the story shifts to Igarashi Ganta, a seemingly ordinary, unassuming middle school student attending Nagano Prefecture's middle school. An escapee, a survivor of the great earthquake, Ganta has no memories of the tragedy and has lived a simple, normal life. This all changes one day when a strange man covered in blood and crimson armour appears, floating, out of his classroom windows. Smirking madly, this Red Man massacres Ganta's entire class and, instead of killing him, embeds a red crystal shard in his chest. Within days of the massacre, Ganta is declared the sole suspect and, following a suspiciously quick trial, is sentenced to life imprisonment in Deadman Wonderland, a massive theme-park-like prison.