If you are referring to later seasons, the 10th episodes follow different arcs:
: 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. To Aru Majutsu no Index Episode 10
Following the loss of his memories, Touma Kamijou encounters Mikoto Misaka for the first time. He subsequently meets a young girl who looks identical to Mikoto, identified as . Throughout the episode, Touma spends time with this "Sister," experiencing a series of comedic and slice-of-life moments. If you are referring to later seasons, the
: Genetic copies of Mikoto created for the Level 6 experiment. calculated nature of Academy City's higher-ups