Dragon Slayer
The Wildcard
Asmodeus Will not Give Up ch 25
I think it's less that, more that Azuma doesn't want it to be animated (or he didn't the last I heard). I mean, as the guy behind the incredibly popular Azumanga Daioh I'm sure he'd have no trouble getting it picked up for adaptation, but if he has the final word and doesn't want that then it's not gonna happen. Personally I'm okay with that. The manga is lovely as it is (would you ever get background detail like that in an anime?) and as you've pointed out, I can't really imagine Yotsuba's VA could ever live up to people's expectations.I've seen this described as un-adaptable