Watch 'D.Gray-man' Episodes:

The story of D.Gray-man takes place on a fictional Earth at the end of the 19th century. The plot mostly centers around Allen Walker, a young boy who is a member of The Black Order; a secretive organization whose members are known as Exorcists. The Order’s primary mission is to stop The Millennium Earl, an ancient being who intends to ‘cleanse’ the world by destroying all life on it.