User blog comment:Omega natsu2/Anime./@comment-4829046-20140330124301/@comment-4829046-20140330163614

Wait, wait, wait. How is it that you mentioned Strike the Blood when I deleted that bit from my comment before publishing? O_o Are you psychic?

Jokes aside, you'd be surprised. Quite a few anime have managed to do 12-13 episodes with just 3-4 volumes. And this was adapted pretty decently imho with 1-cour of 13 eps covering 3 vols. Then you have High School DxD season 1 covering 2 vols with season 2 barely covering 2 and the kicker is that they changed SOOOOO GODDAMN MUCH!!!! You should see the list of anime-LN changes at the DxD wiki. Imagine how well they could have adapted it if they had a 2-cour and didn't spend so much animation cost on pointless fanservice(boob physics and body closeups of nude areas). DxD is a massive and I mean massive story. If you fail to bring out the very bloody introduction to the actual plot(the first 4 vols are basically just an intro) then how do you expect to adapt that complicated and vast storyline?