Kuroshitsuji / Black Butler Book of the Atlantic (Blu-ray release 2017-8-23) is an anime movie that follows the demon butler’s and his human master’s adventure on a zombie-filled luxury liner, which reminds people of Titanic.
For fans of the series, this movie is significant because it does not merely offer all the elements that make it a success. It surprisingly redefines the roles of certain supporting characters, and provides more backstory of the earliest days of the two protagonists spending time together. Fans must not miss this. For people who are new to this series, although it is possible to watch this movie alone, knowing more background from previous anime series will help understand it.