Jinsei Kataoka’s Deadman Wonderland (Japanese: Deddoman Wandārando), with art by Kazuma Kondou, was serialized in Shōnen Ace from May 2007 to August 2013. It has since been published in thirteen volumes.
Ten years after a catastrophic earthquake leveled much of Tokyo, Ganta Igarashi is enjoying what starts out to be a perfectly normal school day with his chums. A red-clad figure floats in through the third-floor window and massacres everyone in the classroom save for Ganta. The killer implants Ganta with a mysterious jewel, then leaves the boy to explain to authorities what happened to his classmates.
Ganta’s story is rather implausible. The authorities have a better explanation for the carnage. It’s clearly the case that diminutive, traumatized Ganta slaughtered the other kids. Ganta is sentenced to death.
That would be that for our young hero, were it not that Japan’s death penalty takes a baroque form.