Toaru Kagaku no Railgun S Episode 21

Darkness (闇) is the twenty-first episode for the second season for the Toaru Kagaku no Railgun anime adaption, and the forty-fifth episode overall. It was first broadcasted on September 6, 2013.

Someone is trying to retrieve Febri and the frog-faced doctor said Febli is a scientifically created artificial object. The situation around Febri only grows more suspicious.

Misaka Imouto tells Mikoto of the existence of Febri's "older sister" and the traces of the "Testament". With hints the dark side is possibly involved, Mikoto decides she cannot tell Saten and the others, but an offhand comment from Kongou leads them all to decide to save Febri.

Not even Anti-Skill can touch the deep darkness of Academy City. Now that they know it exists, Saten and the others immediately beginning thinking up a plan to save Febri.

Adapted from
This episode features original content, as such it is not adapted from any previous material.

Characters

 * Febri
 * Misaka Mikoto
 * Heaven Canceller
 * Frenda Seivelun (flashback-only)
 * Mugino Shizuri (flashback-only)
 * Shirai Kuroko
 * Uiharu Kazari
 * Saten Ruiko
 * Misaka 10032's cat
 * Misaka 10032
 * Kongou Mitsuko
 * Ekaterina
 * Konori Mii
 * Aritomi Haruki
 * Kosako Shunichi
 * Sekimura Hirotada
 * Sakurai Jun
 * Madarame Kenji
 * Nunotaba Shinobu
 * Therestina Kihara Lifeline

Locations

 * Academy City
 * School District 7
 * Heaven Canceller's Hospital
 * Tokiwadai Dormitory
 * Saten Residence
 * Judgment 177 Branch Office