Academy City's peacekeeping forces are absent due to the Avignon invasion. In that now lawless land, shadowy groups start moving behind the scenes.--Those acting for their own interests.--Those who love the dark and revel in killing.--Those trying to destroy others' hope.--Those standing up in defiance for those important to them.--Those bringing the battle to the higher echelons.--Those quelling rebellious elements.--Those who would stop a rampage with violence.In this city, which controls all of science, who will survive?

Touma Kamijou's life is one of perpetual misfortune, which is why no one is more surprised by his sudden stroke of luck than Touma himself! Having won a trip for two to Venice, the City of Water, Touma and Index are excited for a European excursion. But the Italian peninsula is the home of the Roman Orthodox Church, and when old friends and foes alike show up, Touma's hopes for a relaxing getaway might just get washed away!

Seven days have passed since the start of the Daihasei Festival, one of the biggest events of Academy City. Everyone is participating--Seiri Fukiyose is helping coordinate the games, Komoe Tsukuyomi dresses for the part as she cheers for her students, and of course, famous Mikoto Misaka is blowing away the competition. Even Kamijou has appearances! But a shadow has fallen across the celebrations: The Croce di Pietro. This magical artifact threatens the livelihoods of everyone Kamijou holds dear so he dashes off to try and bring Academy City back from the brink. But Oriana Thompson, the magician known as Route Disturb, and the Roman Catholic Church are determined to bring the bastion of science to its knees. Kamijou is going to need all the help he can get-and some luck for once wouldn't hurt!

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!

A certain unlikely hero... Fiamma's plans have finally been set in motion. His ultimate creation, the massive Star of Bethlehem, dominates the skies over Russia. Now he stands ready to purge everything and everyone unnecessary to his grand mission to save humanity. Down below, sorcerer, soldier, and student alike are fighting for their lives against a new calamity that threatens the entire world. After following Fiamma so far for so long, Kamijou knows that there's only one way to put an end to this crisis: Defeat Fiamma and destroy his flying fortress-even if it means challenging God's Right Seat all alone. Rotten luck or not, Kamijou has to do it. After all, Index is still waiting for him...!

Mikoto Misaka is a Level Five esper--one of the most powerful in Academy City. She's so powerful, in fact, that her DNA has been harvested to create a series of clones--the "Sisters." But who is behind these clones, and why would they go to such lengths? The sinister truth is nothing she or Touma could have imagined, and it involves the terrifying Accelerator, the most powerful esper of all time!

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!

Years have passed since Flio was summoned to the world of Klyrode, and quite a bit has changed since he first arrived. Over time, his house has grown from a small cottage where he lived alone with his wife Rys into a bustling community, complete with farmland and a mountain village. The Fli-o’-Rys General Store is now a mercantile giant, responsible for vital parts of the world’s infrastructure and economy. And his older children, Garyl and Elinàsze, have finally graduated from the Houghtow College of Magic, while the younger children in the house have just started attending school themselves. Their busy daily lives are interrupted, however, by a sudden increase in Beast of Disaster attacks that has the Celestial Plane itself reaching out for aid. What became of the legendary nine-headed Hydrana? Has Wyne met her match in another dragonewt? Will Garyl’s flock of admirers ever take a hint? And how worried should we be about Elinàsze’s worsening daddy complex?

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...!

A certain unlikely hero...No one was able to stop Second Princess Carissa's plot in time, so the worst has come to pass: London has fallen. The city of magic, home to the English Puritan Church and Index, now rests in the hands of the Knight faction. Soldiers control nearly every critical part of the country, commandeering the very streets of the capital. Still, the Puritan sorcerers haven't given up the fight just yet!As the battle for the UK rages on, Touma heads to Folkestone to save Index-only to run straight into the coup d'état's mastermind herself! Worse, Acqua is still alive, and his holy sword, Ascalon, is pointing not at Touma but at Carissa!