Toaru Majutsu no Index: Kamigami no Tasogare (Chronicle 1)

What is AIM? What makes the espers capable of doing what they can do? Everyone takes the powers for granted... I mean, He certainly did... Now, after a decade after His disappearance, trouble of unforeseen magnitude brews in the horizon. What can stop the world crisis when "he" is nowhere to be found! Can his descendants live up to this task? Or, will everything be for naught!