In April 1889, Earl Ciel Phantomhive and his servants, Sebastian Michaelis and Snake, board the luxury passenger ship Campania alongside the Midford family—not for recreational purposes, however, but for investigating illegal human experimentation, which is later demonstrated at an Aurora Society meeting headed by a questionable doctor. Deceased individuals are coming back to life, but they have changed into something other than human. What is reviving the dead—a breakthrough in medicine or an unforeseen force?