In a world where Cross Marian came too late to save the son of his friend, Allen Walker is taken in by the Noah who tried to ruin his life. Brought up by the Noahs, Allen comes to believe in them, and make it his personal crusade to bring the Black Order down. But what happens when he starts to meet the Exorcists for real? Will he maintain his convictions, or find a new god?

It has been decades since the Guardians defeated Pitch and restored order to the world; but when Pitch returns with a vengeance, stronger than ever, will they still be able to stand against the Lord of Darkness? And what happens when they find that Pitch is no longer alone, but allied with the one threat that could well destroy the world?