Nagisa Shiota is a known murderer, already undergone trial at the age of 17 for the murder of his mother. He was sent to a mental facility, but Nagisa knows how to act the part to get out. His mother's work was left unfinished. Allen Walker hallucinates demons he needs to destroy, and Cross can't handle him anymore. He can only cover up so many murders before it gets too difficult.

Koro-sensei encuentra un fragmento de inocencia…Ritsu se ofrece a analizarlo, que pasaría si terminara siendo compatible a pesar de no ser humana? Allen después de la guerra se la paso buscando todos los trozos de inocencia…gracias a su Noeh dentro logro sobrevivir por mucho tiempo, que elección tendrá cuando vea el ultimo fragmento que no encontraba en otra persona?