Ore no Imouto to Railgun Collaboration Project!

The Ore no Imouto to Railgun Collaboration Project! (俺の妹と超電磁砲のコラボプロジェクト！), translated as My Little Sister and Railgun Collaboration Project!, is a crossover fiction web series penned by Ore no Imouto ga Konna ni Kawaii Wake ga Nai author and Kamachi Kazuma.

Background
Although not his first foray into fiction related to the Toaru Majutsu no Index universe, with his short story, Toaru Bushitsu no Fanatic (とある部室の), translated as A Certain Clubroom's Fanatic appearing in Pseudepigrapha Railgun alongside Toaru Jihanki no Fanfare, where the characters of Index are treated as fictional characters, this story shows that both stories occur in the same universe.

It was first announced the Machi Asobi event on May 5, 2013, and the first story was published on Dengeki Bunko's page on the Nico Nico service. The first story, titled Toaru Collabo no Girls' Talk (とあるの), was published on June 7 with upcoming stories being published every Friday Pacific Standard Time.

After Fushimi Tsukasa finished his half of the story, Kamachi Kazuma then started his half on September 5, 2013, titled Toaru Majutsu no Index Gaiden Toaru Kagaku no Railgun Ore no Mikoto ga Konna ni Abare Mawaru Wake Ga Nai (とある魔術の禁書目録外伝　とある科学の超電磁砲『俺の“みこうと”がこんなに暴れ回るわけがない』), translated as A Certain Magical Index Side Story A Certain Scientific Railgun "My Mikoto Can't Be This Berserk"

Crossover Stories

 * Toaru Collabo no Girls' Talk (by Fushimi Tsukasa)
 * Ore no Mikoto ga Konna ni Abare Mawaru Wake ga Nai (by Kamachi Kazuma)