Once when Allen was a child, Mana took him to the Cirque du Freak. Now when everything is falling apart at the Order, Allen returns home after years of absence. In later chapters it will take place right after Allen runs from the Black Order. At the beginning it happens around the time Darren first joins the Cirque.

What if Allen had an identical twin brother? And what if after they tired to bring Mana back, Allen vanished? Well Allen's twin became Cross's apprentice and went to the Black Order. I suck at summaries.