Science and magic exist side by side in this world. 
This is the peak of the science side with a curriculum for espers, Academy City. In this city where 80% of the population are students, the season has finally come when all residents are excited and fidgety! 
It's Christmas Eve. 
Amidst the city showing a cheerful hustle and bustle, ordinary boy who can’t keep up with school, Kamijou Touma, also doesn’t intend to miss this event! He was hard at work in his supplementary lessons... 
A backward glance from the default misfortune-prone bastard, the silver-haired sister freeloading in his dormitory, Index, in the heart pounding scene different from the usual, activates a new gluton skill!? While Kamijou tries to desperately stop that, Misaka Mikoto taken in by the Christmas Eve atmosphere appears before him.

World War III is over. Touma disappears. Accelerator spends his days with Last Order and Misaka Worst. Shiage uses the secrets he gained in Russia as a bargaining chip.
 
But this peace doesn't last long as the Freshmen arrive...
 
(Source: Yen Press)
 
Note: Includes 21 prologues, 22 epilogues, and 2 extras.

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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