Board Thread:Questions and Answers/@comment-24994250-20140624204344/@comment-6192846-20140624205900

Content-wise, I'm not the best person to ask either but that blogpost is about some tweets getting exchanged back in 2012 after one or more Ghibli staff member(s) (can't say who) took interest in reading the light novels.

This is rather old news, but it's been understood that they've expressed interest in the series, if not half-joked about making an animated film for it.

Based on the source you linked, the last comment from Moegaku69 was something to the effect of:

"Thank you! Please let us know what you think when you read it again. Please consider animating "The Daughter of Evil" as well (laughs)"

So take that for what you will, but this is in response to (what I assume) is a staff member saying they're "addicted" to the books.

Anime take a while to make so even if Studio Ghibli did make an agreement and have begun (at least) pre-production, we wouldn't know about it for a while. Might be a few years before we hear an announcement.