Board Thread:Questions and Answers/@comment-63.229.128.161-20130326163525/@comment-4631119-20130414105416

Based on 12 books of the LN, yes, it's just 50%, since the anime covered up to early chapters of volume 7.

But, based on the released LN, it's more than 75%, since the last volume released is volume 9.

Lastly, 12 volumes of the LN is including two side-stories, volume 5.5 and 7.5, which most probably won't be included in the anime.