It's an anime about people who TURN INTO BOOKS after they die! What are we even discussing here? Even if it's terrible, it's an anime about people who TURN INTO BOOKS!!! No contest.

Also, VirescentZephyr (a reviewer whose other favourites I like a great deal) gave it a recommendation based on Shinsekai Yori: "Dystopic worlds populated by powerful people in shady, but well-intending organizations with mysterious overarching plots throughout several discrete subplots and similar levels of character attrition along the way. In both series, questionable actions from morally ambiguous characters lead to escalation or resolution, and in neither do the shows assign a simple good or bad metric. Shinsekai Yori is more contemplative and has a feeling of slow dread; Book of Bantorra is packed to the brim with action and takes you along for the ride."