To quash an attack by God’s Right Seat on Academy City, the mysterious Aleister Crowley will utilize even the corrupted power of an angel. But when Touma discovers that angel’s identity, he’ll stop at nothing to save her. Meanwhile, Accelerator is on a mission of his own to rescue Last Order from the ruthless Kihara. Could these seemingly unrelated battles actually be two sides of the same coin…?!

Touma Kamijou just can't catch a break. He might live in Academy City, a place full of more super powered students than you can shake a stick at, but his only superpower is his supernatural lack of luck. He wants nothing more than to keep a low profile, but when a girl named Index comes into his life, it gets more complicated and dangerous than ever!

Item’s battle comes to a head as their hideout is raided, and the team reaches its breaking point. Disgusted with Mugino’s disregard for the other members’ lives, Hamazura finds the resolve to stand up to her. Mugino may be a Level Five, one of the strongest espers in Academy City, but she’ll see that even a powerless Level Zero like Hamazura can put up a fight when his back is against the wall!

In London, the women's dorm in a magicians' base get wild, while in the underbelly of Academy City, Accelerator stumbles upon someone who has been waiting for him all this time.

In the shadows of Academy City, the special team known only as Group is hard at work to solve yet another incident. The Level 5 esper Accelerator and the man who controls both supernatural and magic powers, Tsuchimikado, are investigating a case where their only clue is the word "dragon." While they struggle to find a way to make progress, a member of Academy City's board of directors bears a terrible grudge against them. Once again, Group finds themselves on the business end of a fearsome weapon!

The horrifying experiment to make Accelerator into an all-powerful Level Six has commenced--and it involves the wholesale slaughter of the little sisters cloned from Mikoto Misaka. Can Touma find a way to stop the seemingly invincible Accelerator? Could it be that weakness is stronger than strength could ever be?

It’s a free-for-all on the streets of Academy City as its various shadow organizations take aim at one another! Hamazura and Item hunt down the members of School and the stolen prize they carry. Accelerator and Group rush to try to stop Block’s terrorist plot. And the forces of Member stalk them all! In this battle for the fate of the city, who will come out on top?