Book of Circus: More than a story, a cruel reality! 📷 Image edited in Photoscape: SourceEven though my favorite Kuroshitsuji arc is Book of the Atlantic for reasons of favoritism towards Undertaker's character, if I have to be objective, the best arc for me was Book of Circus and here in this post I wanted to tell you why I consider it the best, even with the current arc of the manga.