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.
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...
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!
An experiment gone wrong leads to the death of a famous mage, and the passing of this illustrious individual sends the Magical Kingdom into mourning. Then, a few months later, the deceased mage’s relations receive letters from his proxy regarding the inheritance of his estate, inviting them to a tiny uninhabited island the mage had used as a getaway cottage/research lab. When Mana gets one of these letters, she’s skeptical, but after careful consideration, she contacts two magical-girl friends to accompany her there...
A certain unlikely hero...Acqua of the Back, agent of the Roman Orthodox Church, has finallymade his move. The incredibly powerful saint and member of God's Right Seat is on the hunt for one thing: Touma Kamijou's right hand! After receiving a warning letter from Acqua, the English Puritan Church dispatches Itsuwa to serve as Touma's bodyguard. But for some reason, the first thing she does after arriving in Academy City is show off her incredible cooking and housekeeping skills. It's enough to bring tears to Touma's eyes, but the freeloading Index only perceives a threat to her position... The comfortable serenity is soon interrupted, though, when their worst enemy appears on the scene...!
Now that Zenjirou’s adventurers on the Northern Continent have come to a close, he and Aura finally hear what made Lucretia so worried—secrets of the White Empire’s remnants and the hidden history of Utgard. Unable and unwilling to ignore the information—as questionable as it might be—the queen decides to send for the former king of the Twin Kingdoms. The meeting needs to be secret, though, and Margarita’s interest in Völundr is the perfect cover. Although Zenjirou has only just returned home, he soon finds himself heading out to the Twin Kingdoms to fetch the royals both publicly and clandestinely. Everything has started to unfold at once with gifts from the Four Dukes, lessons from his wife, and even communications from yet another country in the North. Zenjirou will have to navigate them all, even if it means any hope of regaining his ideal sponger life is all but lost.
A certain unlikely hero... August 31. The day Accelerator meets a strange girl in a back alley and he's sure he's seen her somewhere before. The day Mikoto Misaka finds herself asked on a date by a very pleasant young man. That same day, Touma Kamijou awakes with an especially unlucky feeling. The reason: He's just realized he has completely forgotten to do any of his summer homework. Three characters, three stories, and one last day of summer vacation!
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?
The Maiden Queen of the Magic Kingdom of Klyrode reigns as a benevolent monarch during an age of peace, beloved by her people and acclaimed throughout the lands for her many achievements. Her Majesty, however, has a serious problem—one she shares with her strongest ally, the nigh-omnipotent merchant Flio of the Fli-o’-Rys General Store: a serious case of compulsive overwork! Flio’s wife, Rys, and the Queen’s sisters have all had enough of their respective loved ones burning the midnight oil with no end in sight. And so they come together for a common cause—Flio’s family and the Maiden Queen will go on vacation...together!
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!