Set during the end of a fictional nineteenth century on Earth, D.Gray-man mostly centers around 15-year-old Allen Walker. In his childhood Allen was abandoned by his parents due to a ‘deformed’ left arm and was adopted by a travelling clown called Mana Walker. At some moment Mana died and Allen was approached by a person named Millennium Earl, who offered to revive Mana. The Earl revives him but Mana reappears as a machine called an akuma (???, lit. demon?) that is ordered by the Millennium Earl to kill him and take on his skin, as akuma do. During that moment Allen is gifted with the ability to control his left hand and turn it into an anti-akuma weapon because of a substance called Innocence is embedded in it and against his will, kills Mana. Before Mana dies, he curses Allen’s left eye, which later gives him the ability to see the souls of akuma. After that Allen discovers that the Millennium Earl tries to trick those who have lost loved ones to turn their dead souls into akuma and decides to train himself in order to stop him. Soon after this he becomes the apprentice of general Cross, an Exorcist of the Black Order, a secretive organization which aims to stop the plan set in motion by the Millennium Earl and to save the souls trapped as akuma. However, the Earl has raised an army of akuma, created by taking advantage of grief over one’s misfortune, and summons the direct descendants of Noah himself, the Noah Clan, to aid him in his second attempt. Because of the akuma’s ability to wear a human’s skin, they are nearly undetectable by any human. Allen proves to be a powerful asset as his ‘cursed’ left eye is able to detect the trapped souls within an akuma. Other Exorcist commonly assisting him are Yu Kanda, Lenalee Lee, and Lavi.