Toaru Majutsu no Index SS was first published on July 10, 2007, technically making it the 14th novel published in the series. Despite its name, much of the story is dedicated to Touma and Accelerator's point-of-view, which later converges in the end. It also features Hamazura Shiage, the future third protagonist of the series. The "SS" part is likely taken from the side story of the girls from the Necessarius through Kanzaki Kaori's point-of-view. This is the first sidestory novel by the author Kamachi Kazuma, a format which would later be a recurring staple in expanding the world of Toaru Majusu no Index.
It is also notable for being the first novel published after the debut of the Toaru Kagaku no Railgun manga.
코모에 선생님은 큰 곤혹에 처해지게 된다?! ―「전골과 고기와 식욕의 대전술」
무대는 런던. 마술사 소녀들이 자아내는 흐트러진(?) 하루란? ―「영국 청교도의 여자 기숙사」
학원도시의 어두운 부분으로 떨어져 간 액셀러레이터(일방통행).
거기에서 그를 기다리고 있던 것은? ―「무미건조한 회색의 골목길」
찌릿찌릿 중학생을 꼭 닮은 그 용모.
그녀가 학원도시에 온 이유는? ―「술에 취한 어머니의 사정」
「금서목록」 본편을 보완하는 SS 시리즈 등장!
Kamijou Touma faces his roughest challenge yet-a classroom hot pot party! Meanwhile in London, the women's dorm in a base of magicians may never see another day as wild as this one. And in the underbelly of Academy City, Accelerator stumbles upon someone who has been waiting for him all this time...? Here begins the supplementary SS series of A Certain Magical Index!