Toaru Majutsu no Index SS2 is the eighteenth volume of the Toaru Majutsu no Index light novel series and the second side story volume of the light novel, following SS1. It was released on November 10, 2008. SS2 tells the story of several events that cover the first ten months of the present year of the story's timeline. It covers from the third Friday of January to the second Friday of October, and involves stories from both Magic and Science sides.