Toaru Kagaku no Railgun SS: Dasoku, Mata wa Toaru Jiken no Shūmaku (とある科学の超電磁砲SS 蛇足、またはとある事件の終幕 lit. "A Certain Scientific Railgun SS: A Superfluous Story, or A Certain Incident's End"?), also referred to as Toaru Kagaku no Railgun: PSP SS, is a short story by Kamachi Kazuma which was included with the Toaru Kagaku no Railgun PSP: The Complete Visual Guide. It is set shortly after the events of game, and focuses on Misaka Mikoto and Aizono Mio joining forces to find the latter's teacher, Saitou Souta.