In the Media Factory fan event "Bunko J Natsu no Gakuensai 2013
" held in Akihabara today, it was announced that five light novels will be adapted into anime. One of them is "Madan no Ou to Vanadis
." The light novel started in April 2011, and so far, 7 volumes have been published.
Light novel website: http://www.mediafactory.co.jp/bunkoj/madan/
Madan no Ou to Vanadis