A collection of four short stories and manga from Toaru Majutsu no Index & Toaru Kagaku no Railgun, previously only seen limited release. A single mission is given to Stiyl by the Anglican Church's Necessarius. When Stiyl arrives in Academy City once more, his way is blocked by Theodosia Electra, a fellow member of Necessarius. The reason she is fighting with Stiyl lies with a girl named Patricia Birdway. A battle between magicians over the techniques of the Dvergr from Norse mythology begins.