Chapter 1:lost

16 year old allen walker has returned to the order after kanda and Jonny had a long time of searching
Then as allen hangs out with the science devision he has a expired potion dropped on his head that turns him into a 10 year old again
With his memory's up to when allen first meet mana was erased and his appearance changed
Will they be able to bring allen back to his original state
And during that time something they never expected happed