Set in a fictional 19th century, D.Gray-Man is the story of Allen Walker, who joins an organisation named the Black Order, and becomes an Exorcist. The Order's purpose is to put a stop to The Earl of Millennium's plans to destroy humanity with his army of Akuma. Allen, along with his fellow Exorcists, is able to fight against Akuma using an ancient substance named Innocence, which is the only thing able to destroy them. However, the holy war only intensifies when the Earl gathers the Noah Family, superhuman descendants of Noah, who abhor and have the ability to destroy Innocence.
Both sides soon begin their search for the Heart—the most powerful piece of Innocence—which will ensure victory to the side that finds it.
