User blog comment:B214/Don't ask about season 4/@comment-3965848-20161128145041/@comment-9595671-20161226230023

From what I've noticed, DAL's anime uses three episodes for a volume at most and two at the least. If we had a season three, it would cover all of Natsumi and Origami's arcs because they each had two volumes to deal with their stories.

Volume 12 dealt with Shido before the next one introduced the 9th spirit, and the next two dealt with the final spirit on the Sephiroth Tree, so... yeah, they actually have enough to make a 4th season now.

Yet it's hard for a light novel anime to even get a third series at times, for a 4th that's very unlikely. I know for some series it's just the works. Sword Art Online for example? I don't think it'll get a third season simply due to the fact the arc after Mother's Rosario is 10 volumes long, how do you fit about 24-26 episodes into that without removing a lot of material?

If they could make a device that creates animation and art just by reading someone's mind, then I bet these limitations LN anime adaptions have could be avoided with only a story arc being incomplete in stopping a new season from being made as it would remove most of the issues related to a budget.