Side-story novel to the Index/Railgun. 
Misaka Mikoto is invited to Russia to demonstrate the abilities of Level Five in a shopping mall. There she meets a girl named Lessar.

Welcome to a world where mysticism and science collide, and supernatural powers are derived from either science or religion. At the heart of this world is Academy City, an advanced metropolis whose population is comprised mostly of students The majority of students are enrolled in the city's "Power Curriculum Program," where they must learn to master their latent psychic powers. Out of several million students, only seven are deemed powerful enough to have Level 5 status. 
Meet Mikoto Misaka, the third most powerful Level 5 esper in Academy City. Together with her best friends Kuroko Shirai and the other members of Judgment, a student-run law enforcement agency, Mikoto delves deep into the dark heart of the scientific sprawl she calls home, and uncovers secrets she wishes she hadn't! 
(Source: Seven Seas Entertainment) 
Notes: 
- Includes 8 extra chapters. 
- Volume 5's special edition includes the volume "Giten Railgun".

Gaiten Shoku is a series of light novels that physically compile side-stories for the Toaru Majutsu no Index franchise that were originally included in DVD/Blu-Ray limited editions, magazine issues of Monthly Comic Dengeki Daioh, and other various releases.
 
Included Stories in Volume 1 (2020/6/10): 
- Kanzaki Kaori (神裂火織編); 2010/1/29 - 2010/8/27 
- Necessarius Special Admission Test (『必要悪の教会』特別編入試験編); 2013/7/24 - 2014/2/24 
- Road to Endymion (ロード トゥ エンデュミオン); 2013/2/23 
Included Stories in Volume 2 (2020/8/7): 
- A Certain Scientific Railgun SS (とある科学の超電磁砲SS); 2009/1/23 - 2009/8/21 
- A Certain Scientific Railgun SS2 (とある科学の超電磁砲SS2); 2011/1/26 - 2011/9/22 
- Cold Game (コールドゲーム); 2017/12/27 
Included Stories in Volume 3 (2024/12/10): 
- Agnese's Magic Side Work Experience (アニェーゼの魔術サイドお仕事体験編); 2020/4/30 - 2020/12/25 
- Biohacker (バイオハッカー編); 2019/10/30 - 2020/2/28 
Included Stories in Volume 4 (2025/2/7): 
- Stativarius (ステートバリウス編); 2018/12/26 - 2019/7/31 
- A Truly Crazy Way to Get Misaka Mikoto and Shokuhou Misaki to Flirt (御坂美琴と食蜂操祈をイチャイチャさせる完全にキレたやり方); 2025/2/7

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