"Investigation" (捜索 Sōsaku?) is the 57th chapter of the Toaru Kagaku no Railgun manga series.
Uiharu Kazari awakes from her little scuffle with Kouzaku Mitori as Saten Ruiko and Shirai Kuroko investigates on how they were brainwashed. Meanwhile, Misaka Mikoto and Shokuhou Misaki working separately, finally subdues the enigmatic Kihara Gensei. As Kazari and Kuroko continue their investigation as members of Judgment, Ruiko is left alone, but an unforeseen event not before seen in the Toaru Majutsu no Index may befall upon her, as Kamijou Touma passes by looking for something that Ruiko coincidentally has.
In order of appearance:
- Uiharu Kazari
- Misaka Misuzu
- Saten Ruiko
- Shirai Kuroko
- Misaka Mikoto
- Shokuhou Misaki
- Kouzaku Mitori (referenced only)
- Kamijou Touma
No new characters were introduced in this chapter.
No new abilities were introduced in this chapter.