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Toaru Kagaku no Railgun SS2: Shopping Mall Demonstration is a story written by Kamachi Kazuma, released in parts in the limited edition DVDs and Blu-rays of the Toaru Majutsu no Index II anime. The story consists of eight parts, and together can easily equate to a regular Index novel in length. The individual parts were later collected into Toaru Majutsu no Index: Gaiten Shoku Light Novel Volume 02 alongside Toaru Kagaku no Railgun SS: Liberal Arts City and Toaru Kagaku no Railgun: Cold Game.
Taking place before the events of the Toaru Kagaku no Railgun manga, the story is set in Russia where Misaka Mikoto takes part in a demonstration on the behalf of Academy City, but things don't pan as scheduled as Mikoto meets the mysterious New Light.