D.Gray-manD.Gray-man.

D.Gray-man is a Japanese manga series written and illustrated by Katsura Hoshino. Set in an alternate 19th century, it tells the story of a young Allen Walker, who joins an organization of exorcists named the Black Order. They use an ancient substance, Innocence, to combat a man known as the Millennium Earl and his demonic army of Akuma who intend to destroy humanity.