The Daihasei Festival has started, and naturally that signals Tokiwadai Middle School—a renowned all‑girls institution—enters the contest as well. Even though Mikoto Misaka, dubbed the 'Tokiwadai Ace,' is in the mix, her classmates persistently pour every ounce of effort into triumphing, regardless of how daunting the challenge appears against her sheer power. Yet the event isn't solely a celebration. Because of the festival, Academy City becomes accessible from outside, prompting multiple groups to devise plans for breaching its borders. Misaka seems to have caught their attention, and as festivities continue, shadowy figures start surfacing. Toaru Kagaku no Railgun T reintroduces the Tokiwadai Ace alongside her companions as they plunge further into Academy City's sinister underbelly. Ranging from terror assaults to brutal covert ventures, every scenario is conceivable within this metropolis. The stakes are, and the mystery unfolds as allies and enemies collide.
