Accelerator’s first mission for the enigmatic organization Group starts. It seems simple—take down the rebellious Level Zero force Skill-Out. Mysterious benefactors, unlikely allies, and the appearance of a new faction make it anything but. The prelude of war is upon Academy City!

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!

Itsuwa and the Amakusa Church struggle to defend Touma from Acqua of the Back, but it seems like even their combined strength won’t be enough...until their own ace in the hole arrives! Kaori Kanzaki returns to aid her comrades in their hour of need, setting the stage for a deadly duel. Will there be anything left of Academy City after the two saints clash?

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…?!

"First published in Japan in 2019 by Square Enix Co., Ltd."--Colophon.

Index and Touma are ordered by the Queen of England to investigate the Eurotunnel bombing incident. The perpetrators—an organization called “New Light”, whose plans promise to bring massive changes to Britain! Can Touma intercept them in time to stop their scheme before it gets out of hand?!