: This is the first time the audience learns about the "Tree Diagram" calculations and the horrific scale of the experiment.
If you are referring to later seasons, the 10th episodes follow different arcs: To Aru Majutsu no Index Episode 10
: The episode explores the cold, calculated nature of Academy City's higher-ups, who view the clones as mere "disposable equipment" rather than human beings. : This is the first time the audience
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 calculated nature of Academy City's higher-ups