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... In Academy City, where superhuman abilities are scientific reality, Touma Kamijou is trying to reconstruct a life for himself, but that's easier said than done with a girl by his side with the arcane knowledge of 103,000 grimoires rattling around in her brain... Now seemingly inextricably caught up in a world where magic is a reality, Kamijou learns that a certain shrine maiden is being held captive in one of Academy City's cram schools. Can Touma ally himself with a sorcerer who has on more than one occasion tried to do him in? The only thing he knows for sure is that he really does have rotten luck...

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?

As the dust settles from their encounter with the Freshman, Touma Kamijou, Shiage Hamazura, and Accelerator finally cross paths in Academy City. It won’t be long before these three find themselves with yet another challenge on their hands—explaining what the heck they’ve been doing to everyone who was worried about them! The boys have survived more than one scrape with death but it’s anyone’s guess if they’ll live through this...

Index faces the biggest threat to her life thus far: the assassin Kanzaki Kaori--and Touma's right hand is useless against her! When Kaori reveals the truth behind Index's very existence, Touma realizes just how bad his unlucky streak has gotten...

A certain unlikely hero... Touma Kamijou has the worst luck imaginable... Sure he's a citizen of Academy City, a scientific marvel of the modern world where superhuman abilities are artificially cultivated and commonplace, but when it comes to paranormal talent, Kamijou's been classified a Level Zero-a loser, basically. Oh, he does have one trick up his sleeve (literally), but even that's more trouble than it's worth. When Kamijou encounters a delusional young girl convinced she's a nun and raving about being chased by evil sorcerers, he's eager to send her on her way and get back to failing his studies. Fate, it would seem though, has other ideas, and he suddenly finds himself caught up in a supernatural intrigue with a girl named "Index" at the center! Science and magic collide in this first volume of one of the most popular light novel series ever penned!

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...