The Great Holy War had ended. Allen Walker had become the Noah and joined the third side of the war and defeated the Noah family, gaining the title as Millenium Earl himself. However, the title as well as being a Noah came along with a price: eternal life. Allen kept on moving forward, eventually stumbling upon the wizarding community on one fateful night. NO PAIRINGS

The excorcists encounter an Akuma with time controlling abilities. When cornered, this Akuma uses said ability to try and bring back assistance from another time. However, he unintentionally brings a child back. Lenalee rescues the little boy from the demon, and she becomes the mother he always wanted.

Allen knew running wouldn't be easy, and that his life would only get more uncertain from now on. What he hadn't counted on was a wrong turn in the Ark, a trip to an impossible place, or how this detour might affect his journey. [DGM post-Ch. 205; HP Year 6.]

Kanda does not like people. He likes children even less. Teaching them should be out of the question. Regrettably for the irritable swordsman, his fellow Exorcists are indisposed and the duty of researching a magic school falls to him. How unfortunate.

Komui becomes suspicious of Hogwarts, and especially 15 year old Harry Potter. So he sends Allen alone to investigate the wizard school. There may be innocence involved. Allen is undercover as a teacher, even though he is the same age and younger than some of the students.