Talk:Misaka Mikoto/@comment-4908660-20131208091837/@comment-5230978-20131210171220

Index anime is the light novel's adaptation while Railgun anime is the adaptation of the homonyn manga (probably even the 2 long stories will be adapted in next seasons). In Railgun anime there are also filler episodes as well as also original arcs written by the Toaru series' author, at least in the first anime season. These arcs are considered part of the canon timeline, though is actually unknown if the one in second season will too, but are present some discrepancies with it (like Kongou Mitsuko being present before the Three Stories arc).