I've probably watched anime longer than most of you (I watched Astro Boy in first run on a B&W TV!), and there are certain things I like more than other things: I like heroes who lay it on the line, who accept the challenge, who stand between Danger and Everyone and Everything else. (Similar stories can be found in the old TOEI classics of my youth Horus, Prince of The Sun (Little Norse Prince), The Wonderful World of Puss 'N Boots, and Animal Treasure Island.)There were a couple of warnings that quality was starting to slip in the second season. The first was the identity of the main villain, the Roman Catholic Church. To begin with, this was better than most modern American television or movies in that they recognized a difference between the Roman Catholic Church and the Protestant churches; however, despite the cleverness of the story, the portrayal rather quickly degenerated into young, busty, beautiful, skimpily attired nuns... Not that I have anything particularly against that, but it certainly called the rest of their research not to mention their underlying motives into question... Nevertheless, that along with the brilliant humor of the middle part of the series had me thinking this was another brilliant effort until I reached the last story arc, which was basically just a prelude to the third season (A Certain Magical Index: Season 3, Part 1 (Blu-ray/DVD Combo) and A Certain Magical Index: Season 3, Part 2 (Blu-ray/DVD Combo)) that would take several YEARS to get finished, which is no way to end a TV series even temporarily.Note: As near as I can determine right now, the series should be watched in the following order: A Certain Scientific Railgun: Season 1 (Blu-ray/DVD Combo), A Certain Magical Index: Season 1 (Blu-ray/DVD Combo), A Certain Scientific Railgun S: Season 2 (Blu-ray/DVD Combo), this set, and A Certain Magical Index: The Movie - The Miracle of Endymion (Blu-ray/DVD Combo).