J.C.Staff's highly anticipated sequel to 2011's series sees Academy City engage in a war against the Catholic Church. Toaru Majutsu no Index centers on the uneasy union between magic and science, with the line separating the two often blurring. Serving as the scientific community's primary hub, Academy City is home to countless students seeking to understand and improve their psychic abilities. At first glance, Touma Kamijou comes across as a painfully ordinary and powerless teenager, but that could not be further from the truth! Inheriting the "Imagine Breaker" ability, Touma can negate anyone else's powers! As various organizations pursue their own agendas, Touma is inadvertently dragged into a world-wide conspiracy that could alter the course of history!

Out of nowhere, Kirito is pulled into Underworld, a virtual reality set in a grandiose fantasy world. Unable to recall the events that led to this situation, Kirito is left with no choice but to depend on a remarkably lifelike NPC for guidance. Eugeo claims to be merely a resident of this peculiar world, but Kirito cannot help feeling like there is more to this NPC than meets the eye. Plagued with dreams depicting a time when he played with Eugeo and a blonde girl named Alice in this same virtual reality, Kirito sets out to recover his memories and, hopefully, find a way out of Underworld.