D Gray man, Vol. 22 Category:Gray letter D Wikimedia Commons CATHOLICVS: Santa Misa en la Baslica de Santa Mara la Mayor y old industrie II by Mondkringel on DeviantArt. A cursed teenage boy saves mankind one soul at a time. Set in a fictional 19th century England, D. Gray man is the story of Allen Walker, a 15 year old boy who roams the earth in search of Innocence. Washed away to unknown parts of the world after The Great Flood, Innocence is the mysterious substance used to create weapons that obliterate demons known as akuma. Struggling with mounting turmoil over his own identity, Allen meets The Cardinal. Who is he? What is he? Why is he interested in Allen? The answers are startling, and arrive with a vision that shocks the young demon fighter to the core!