Toaru Kagaku no Railgun Manga Chapter 054

Adapted From
This is a manga original story, thus it is not adapted from a light novel.

Characters
In order of appearance:
 * Kouzaku Mitori
 * Misaka Mikoto
 * Uiharu Kazari
 * Heaven Canceller (cameo)
 * Misaka Misuzu
 * Shirai Kuroko
 * Saten Ruiko
 * Shokuhou Misaki