Mary is blown from Japan to the world of D. Gray Man.
In her world, there was no manga(D. Gray Man) and she was suddenly confused in the forest.
In addition, there was a AKUMA in front of the Mary. The AKUMA tries to attack her.
She runs away to avoid such events with her own brightness and courage.
However, AKUMA will catch up with a little later.
She is helped by Kanda and Allen in a pinch of absolute desperation.
They were exorcists dispatched from the Black Order to the land here.
Then she gets caught up in an incident related to innocence.
That led her to become an exorcist.
This story is the story of a few years after she settled down as an exorcist.
The around the same age girl of the black order is less, but outside she made a friend called Emily.
But Emily had a secret.