D.Gray-man is the story of Allen Walker, who roams a fictional 19th century Earth in search of Innocence, a mysterious substance used to fight demons called akuma.

Allen questions whether he is willing to fight the Clan of Noah--after all, he signed up to kill akuma, not humans! With his left eye injured, he can no longer tell akuma from humans, making him a target for attack. Despite this weakness, he is sent by the Black Ministry to find and protect his master, General Cross.