A certain unlikely hero...Only Komoe's class would let a regular conversation spiral out of control into a grand-scale hot pot party. It's an open question whether her students are a blessing or a curse. Meanwhile in London, the English Puritan Church's facilities should generally be a place of prayer and quiet contemplation...So who's going to take responsibility for the chaos unfolding in the sisters' dorms?! Back in Academy City, a certain railgun's mother has suddenly popped in for a visit, which is more than enough to make even a Level Five esper panic!

Summer vacation is over, and it's time to go back to school! The new school year brings a new friend for Index--the lovely, thoughtful Hyouka Kazakiri. But there's a new problem too, and it's tall, blond, and ready to ruin Touma's day--the terrifying magician Sherry Cromwell!

A certain unlikely hero... It’s another exciting, messy time in Academy City as Uiharu repels a massive hacking attack on the data banks. Elsewhere, Hamazura, Hanzou, and Komaba speed away from the scene of their most recent crime, only to quickly regret their choices after one cop makes it her life’s mission to catch them—no matter the cost in property damage. Meanwhile, in the dark underbelly of the vaunted scientific city, Hanzou must come to terms with his dark lineage or face the consequences. And in that same shadowy world, several Misaka Sisters have gathered for their next mission to…look up their horoscopes?

Kanzaki Kaori is on the hunt for the culprit who murdered her jeans while Kamijou Touya is on the hunt for a good souveiner from Milan. Elsewhere, Kuruwa begins to fall for Hanzou. At the same time, Hamazura is most definitely not in love with Kinuhata, movie date or not. In the background, the Misaka Sisters' latest obsession is fortune-telling with blood types. The world of science and magic never ceases to be an exciting, hot mess...

After bringing an end to World War III, Touma Kamijou disappears from the world. Both sides--magic and science--take the time to rest and regroup. While Accelerator spends his days with Last Order and Misaka Worst, Shiage Hamazura uses the secrets he gained in Russia as a bargaining chip and returns to Academy City to reform Team ITEM. It seems like peace is here at last. That is, until a new group called the Freshmen arrive...

A certain unlikely hero... Ever since the attack on Academy City, the disputes between the magic side and the science side have been getting worse day by day. Now protests have broken out in France, instigated by a sinister magical artifact, and world tensions are nearing their breaking point. Unable to just stand and watch, Touma Kamijou flies off to Avignon in order to use his trump card, Imagine Breaker, but he should be a little more wary of what could be waiting for him in the historic stronghold of the papacy...