第 4 集: 御坂美琴救出削板軍霸，並發現御坂美鈴操縱了驅動器並抹除了朋友們的記憶。

Mikoto rushes in to rescue Ruiko from some suited people as she searches one of the unused grounds for Shadow Metal, only to discover they were simply security officers doing their job. Meanwhile, Kazari uses her hacking skills to discover the site that Ruiko got the rumor about Shadow Metal, keeping what she learned to herself. The next day, Mikoto discovers that Misaka 10032 has gone missing, learning that she was taken away by an ambulance whose drivers were being manipulated by Misaki. After failing to get any answers out of the drivers, Mikoto finds herself being placed under the guard of Misaki's clique before discovering that Kuroko, Ruiko, and Kazari have all had their memories of her stolen from them by Misaki. (Source: Wikipedia)

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