The strongest Level 5 esper, Accelerator, is conducting experiments on Misaka Mikoto's clones. Kamijou Touma intervenes, leading to a fierce battle that almost costs Touma his life. Mikoto arrives to aid Touma, and the combined efforts of the pair lead to the near destruction of the experimental site.
Following his encounter with Misaka Mikoto, Kamijou Touma finds himself facing Accelerator, the strongest Level 5 esper in Academy City. Accelerator is conducting the 10032nd experiment in the Level 6 Shift project and is mercilessly killing the clones. Touma challenges Accelerator to spare Misaka 10032. Despite Accelerator's overwhelming power, Touma refuses to back down. Their battle causes significant destruction and nearly costs Touma his life, as Accelerator attacks with his vector manipulation abilities. Mikoto eventually arrives, witnessing Touma's heroic stand against Accelerator. The situation escalates further when Accelerator attempts to use a devastating new technique. Mikoto and...