First off when I began watching the "A Certain... series" I was kind of iffy to be perfectly honest, not a big fan of index. However, with that being said I LOVED railgun by far one of my favorites not gonna lie. The growth of the characters and the story they tell... True friendship... Never giving up... Always staying true to yourself... And or of course asking for help! Though I may have made it sounded all soppy, it's definitely not lol, action but not too much action, comedy but not over done, and love but not that omg wtf did I just watch *-*Though if you're watching index and feel you have to watch it because you have to in order to watch railgun(s) you don't I mean there are fillers throughout the show but I watched all of railgun before watching index and you really don't miss anything, though, I do fill like railgun S fits more with index than the first railgun does but I see what they were trying to do.... But you'll just have to watch to find out for yourself lol

However I'd watch it again and again the characters are all positively amazing XD