Tokiwadai Middle School--a place bathed in the envious gazes of all the schoolgirls in Academy City. Every single one of its female students is a proper young lady, and none more so than Mikoto Misaka. Kuroko--a Level Four teleporter and a member of Judgment, the organization that preserves public order in the city--knows this all too well. She invites her darling Misaka out to go shopping, but that's just the beginning of what ends up being a very, very long day, one in which she sees Misaka's true form and may wish she hadn't...

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!

Kazakiri has only begun to see what her terrible secret is. Meanwhile, Sherry Cromwell's plan to tear apart the worlds of Magic and Science by is coming to a head--unless Kamijou Touma can do something about it first!

The trio that hopes to be together again couldn’t be further apart. When Ikebukuro’s underground is set on a collision course, no one is safe. Dollars co-founder, Mikado Ryuugamine, continues his lonely struggle to purge his group of undesirables. Former Yellow Scarves leader, Masaomi Kida, returns to the city to make amends for his past. The owner of the curse blade, Saika, Anri Sonohara, seeks the truth from the two boys who keep leaving her in the dark. The three of them used to be the most important parts of one another’s lives, but now their secrets keep them separated. With a certain information broker whispering in Mikado’s ear, will their friendship survive the color gangs’ struggles? Ikebukuro is going to be busy!”

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!

Kuroko Shirai is embroiled in a case that involves her beloved "big sister," Mikoto Misaka. As Kuroko squares off against a fellow teleporter for the remains of the orbital supercomputer known as the Tree Diagram, the effects of their battle reach far and wide--affecting Mikoto, Touma, the worldwide network of Misaka clones...and even Academy City's strongest esper, Accelerator!