Travis Bruno of Capsule Computers writes:
"A Certain Magical Index and its spin-off series following Mikoto Misaka have proven themselves to be quite popular in Japan with each series getting two anime seasons so far and both continuing in their long running light novel and manga origins. While the first season of A Certain Scientific Railgun was released originally in Japan back in 2010, North America saw the English dub released back in 2013 so we did not have to deal with the three year wait in-between seasons. Instead a little over a year later we have the first half of A Certain Scientific Railgun S now available in English. While the first season may have left something to be desired, does this second season start out right?"