User blog comment:A certain someone/The ONE and ONLY FLAW of the Railgun Anime/@comment-24516349-20140327052551/@comment-24551285-20140327054340

I seriously don't think that it is ecchi. This is proven by:

1) http://www.mangareader.net/1007/to-aru-majutsu-no-index.html

2) http://mangafox.me/manga/to_aru_majutsu_no_kinsho_mokuroku/

3) http://www.mangahere.com/manga/to_aru_majutsu_no_index/

4) http://mangafox.me/manga/to_aru_kagaku_no_railgun/

5) http://www.mangahere.com/manga/to_aru_kagaku_no_rail_gun/

Those genre does not state that it is ecchi.