Sisters.Accelerator stops and redirects Misaka's attacks back at her using vector transformation, controlling elements like kinetic momentum, heat or electrical charge by touch. When Tōma returns from the bookstore, he finds Misaka's dead body in the dark alley and calls the police department, but the body has gone missing when trying to find it. A confused Tōma continues to search the alley, soon relieved to find Misaka alive but horrified to see her carrying a body bag containing the body he had seen in the alley. Dozens of identical girls resembling Misaka then appear, revealing that they are all part of a confidential experiment and are mass-produced military-use somatic cell clones of Mikoto Misaka called the Sisters, in which the one he has already encountered, currently carrying the body bag, is named Misaka 10032. Tōma plans to go see Mikoto at her dormitory to learn the truth behind the Sisters, considering how Mikoto treated Misaka earlier. However, he ends up waiting alongside Kuroko, who is Mikoto's roommate, but is forced to hide under Mikoto's bed when the Tokiwadai Dorm Supervisor comes by for inspection. Tōma finds and reads a report about Tree Diagram's calculated methods for how Accelerator, the most powerful Level 5 esper in Academy City, can evolve to Level 6 by fighting the Sisters at special battlefields where he will gain experience from combat and finds a map with several red X marks on it. Now aware of the truth, Tōma goes to confront Mikoto.