Shinyaku Toaru Majutsu no Index: Birthday Through the Glass

Shinyaku Toaru Majutsu no Index: Birthday Through the Glass (新約 とある魔術の 禁書目録 (インデックス)  ガラスの向こうのバースデー) is a short story written by Kamachi Kazuma that is featured in Dengeki Bunko Magazine Vol. 61 alongside other stories from famous Dengeki Bunko authors.

Publisher's Summary
Kihara Kagun, a teacher known as the Student Keeper who watches over the children of Academy City.

He was the strongest of his generation among the heretical Kihara researcher family and this is a story of him cracking down on the evil running rampant in Academy City.

Characters
By order of appearance:
 * Kihara Kagun
 * Kumokawa Maria
 * Kihara Noukan
 * Kihara Yuiitsu
 * Kihara Byouri (referenced)
 * Aleister Crowley (referenced)

Locations

 * Academy City
 * District 13

Trivia

 * Despite being on the cover, Touma and Index are not in the story.