Mikoto discovers her own clones are being murdered one by one, and the show never flinches from what that means. The Sisters Arc turns a spinoff character into someone you'd follow anywhere, because watching her choose to stop a massacre forces you to watch her break and rebuild herself across sixteen episodes. By the end, you're not thinking about superpowers or Academy City anymore, you're thinking about a girl who couldn't save everyone, and what she does with that failure.

Mikoto Misaka is one of Academy City's most powerful espers, a headstrong Level 5 electricity user ranked third in the city. That certainty shatters when she encounters an exact duplicate of herself, and the truth emerges: a shadowy organization has created thousands of clones bearing her face, all designated for a horrifying purpose. They are being hunted and killed systematically as part of an experiment meant to push a cruel esper to the top of the city's power rankings. Desperate to protect her sisters, and believing she helped make the project possible, Mikoto becomes determined to shut it down. The forces standing against her prove far more dangerous than she expected, and the conspiracy turns out to have claimed other victims, drawing in her friends from Judgment. Academy City's scientific establishment harbors secrets worse than anyone suspected, and this second season of the action and sci-fi series sets Mikoto against some of its strongest espers.