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 as part of the February 2018 issue of Monthly Comic Dengeki Daioh, 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: Ability Demonstration Trip.

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.