D.Gray-man(Zone) is a one shot manga that is considered the pilot or  starting point of D.Gray-Man. It is also known as chapter "0" of D.Gray-man and shares many similarities to the story.

A born exorcist, Walker's primary anti-akuma weapon is the cross that's embossed on his red, disfigured left hand, which contains Innocence. But not only does Walker destroy akuma, he sees the akuma hiding inside a person's soul! Together with his fellow exorcists fighting under the command of the Black Order, Walker leads the battle against the Millennium Earl, the evil being out to destroy mankind.
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(Source: Viz Media)

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