In the run-up to the Daihasei Sports Festival, Mikoto Misaka, along with other Level 5 espers, is approached with the offer of giving the athlete's pledge during the festival's opening ceremony. Meanwhile, when a fight breaks out between cheer squads over the use of the main stage, Kazari Uiharu steps in to try and stop them. This attracts the attention of the seventh-ranked Level 5 esper, Gunha Sogīta, who ends up causing more harm than good with his powerful yet unknown ability...