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.
A Level 4 akuma is targeting Komui. Lenalee wants to face the akuma, but she has to reclaim her Innocence to do it, and Allen must go in for the attack! Later, an experimental virus created by Komui has started turning members of the Black Order into zombies! Can Komui fix what he started?