Toaru Kagaku no Railgun: Cold Game

Toaru Kagaku no Railgun: Cold Game (とある科学の超電磁砲 コールドゲーム) is a short light novel released on December 27th 2017, celebrating the manga's 10th anniversary. It is later included in Toaru Majutsu no Index: Gaiten Shoku Light Novel Volume 02 alongside the compilations of Toaru Kagaku no Railgun SS: Liberal Arts City and Toaru Kagaku no Railgun SS2: Shopping Mall Demonstration.

During a Social Studies field trip to the Central Anti-Skill Station, Saten Ruiko discovers that a person in the background of one of the photos on her smartphone is a criminal on the wanted list. As a result, Saten, Uiharu, Mikoto and Kuroko find themselves involved in the Cold Sleep Murder Case.

Characters

 * Saten Ruiko
 * Uiharu Kazari
 * Misaka Mikoto
 * Shirai Kuroko
 * Yomikawa Aiho

New Characters

 * Alfonso Brookman (referenced-only)
 * Asajimo Saemi
 * Asajimo Mebuki
 * Innai Chigiri
 * Puppy Prosecutor
 * Tsujinaka Kyouka
 * Matsuoka Raita
 * Nakamura

Abilities

 * Electromaster (Railgun-variant) - Misaka Mikoto, Level 5
 * Teleport - Shirai Kuroko, Level 4
 * Ion Trade - Matsuoka Raita, Level ?

Locations

 * Academy City
 * School District 1
 * Academy City General Courthouse
 * School District 2
 * Unnamed university hospital
 * School District 7
 * District 7 Central Anti-Skill Station

Trivia

 * The parts of the story are designated after the Tarot's Major Arcana, in numerical order.
 * The story shows glimpses of how Academy City has not only a constitution but also the inner workings of its judicial system.