In the original series of Toaru Majutsu no Index (Season 1), is titled "姉妹 (Sisters)" . It marks a significant shift in the story as it introduces the "Sisters Arc," which focuses on the scientific side of Academy City and the dark experiments occurring there. Plot Summary
: The protagonist who is still adjusting to life after losing his memories.
: The "original" Level 5 esper who is increasingly suspicious and distressed. To Aru Majutsu no Index Episode 10
: Index provides thematic commentary by comparing the scientific pursuit of "SYSTEM" (Level 6) to the magical concept of the Tree of Sephiroth from Kabbalah. Episode 10 in Other Seasons
However, the episode ends on a dark note. Another clone, , begins a predetermined battle with Accelerator , the strongest esper in Academy City. This fight is revealed to be part of the "Level 6 Shift" experiment, a project aimed at evolving Accelerator into the first Level 6 esper by having him kill 20,000 Misaka clones. Key Character Appearances In the original series of Toaru Majutsu no
: Focuses on the Daihaseisai (Sports Festival) , where Touma and Motoharu chase Oriana Thomson to prevent the use of the "Stab Sword" artifact.
: Genetic copies of Mikoto created for the Level 6 experiment. : The "original" Level 5 esper who is
: This is the first time the audience learns about the "Tree Diagram" calculations and the horrific scale of the experiment.