The Sisters Arc in the Railgun S anime is an alternate presentation of a story arc that was already covered in the Index anime's first season. In general, our forum rules are that anything that didn't happen in *this show* can't be discussed in anime threads for this show. But given this rather-unique situation, people who already watched the Index anime will have a unique perspective on the way this arc is presented in Railgun S.
In this thread, people may discuss the Sisters Arc as it compares to the perspective from the Index anime, including things that have not yet been shown in the Railgun anime but were alluded to in the Index anime, and speculation about how this may be presented.
However, all novel and manga spoilers are forbidden in this thread. Please use the existing
Spoiler & Speculation thread for this.