[djmaca]

Originally Posted by MrTerrorist

Spoiler for Actually:

It's more like a sidestory since the current chapters i read (Volume 2) in Railgun is around the same time when Touma first meet Index.

Have you been looking at each chapter's dates....

Spoiler for dates:

The first Volume = June 17(First time Mikoto and Touma met) to July19(Discovery of LeveL UppeR)
Touma met Index = 4 days before July 25 or 26, the day his memory got blasted along with the Tree Diagram and the satellite...