Life has mostly returned to normal for the high schooler who knows nothing but misfortune, Touma Kamijou. But in a stroke of unbelievably good luck, he manages to snag two tickets for an overseas getaway trip! Of course, Kamijou is a veteran by now and immediately searches for a sinister trap or a hidden downside to this strange turn of events.Unable to find anything obviously wrong, he anxiously sets off with Index to visit Venice, the "City of Water." Could this actually be a chance to rest, sightsee, and maybe even have a heart-throbbing romantic rendezvous? Just as Kamijou begins to relax and enjoy himself, he can't help but notice some strangely familiar faces hanging around...Is everything really going Kamijou's way for once, or is there something more to this too-good-to-be-true adventure??

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!

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!

As schemes and plots continue to plague Ikebukuro, the Dollars are still going missing-and all ending up in one place. On the other hand, as Anri watches over the unconscious Kadota, a certain information broker arrives. And what he has to say is troubling...

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!

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...!

Though he gave his all during the festival to save Academy City, Touma still spectacularly lost his bet with Mikoto. Now he's a slave to her every order until she's completely satisfied! But that's the least of his worries--a jealous Kuroko just might kill him, Little Misaka is about to explode, Index is nowhere to be found, and then there's this girl who seems totally lost... Meanwhile, Accelerator is busy settling into his new life when he notices Last Order is missing. Fearing the worst, the former villain launches a frantic search only to find a starving girl in a white nun's habit...