Toaru Kagaku no Railgun: Since her encounter with Kurozuma, Mii hasn't been coming to work. Curious, the girls visit her dorm, where they meet Mii's roommate. She reveals that Mii was once a member of Big Spider, which was a more friendlier group back then, and despite being an esper, she was allowed to stay by their leader Kurozuma who she was in love with. When Mikoto receives word that the Anti-Skills will be leading a surprise crackdown against the Skill-Out gangs the next day, she confronts Mii on why she won't leave the past behind. Mii explains that she left the gang when Kurozuma supposedly died during a fire, later becoming a member of Judgment. Kurozuma appears and explains to Mii how he was hospitalized after the fire, while she tries to convince him not to end Big Spider all by himself. Later, Mikoto has a epiphany and finally understands Mii's reasons. As the crackdown begins, Mikoto, Kuroko and Mii help Kurozuma fight the Big Spiders and destroying their weapons including Capacity Down. With only him remaining, Hebitani threatens to light a bomb strapped on his chest, but is knocked out by Kurozuma. As the Big Spider's are arrested by Anti-Skills, Kurozuma asks Mii to arrest him as well where they reconcile.

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Action, Animation, Comedy, Japanese, Sci-Fi