D.Gray-man is the story of Allen Walker, who roams a fictional 19th century Earth in search of Innocence, a mysterious substance used to fight demons called akuma. Amidst the fighting in Japan, the Millennium Earl goes after Lenalee until Allen makes a timely appearance. But their reunion is cut short when the earl traps the exorcists inside Noah's Ark. Now Allen and his friends have just three hours to find a way out before they are lost forever!