"Just as you are one hell of an exorcist, I am merely one hell of a butler."
When an increase in demon attacks at True Cross Academy town causes a reaper from the Phantomhive case of 1896 to be sent in to investigate, the Board suspects one of the Sons of Satan is behind the attack but what they aren't aware of is that they've pinned the blame on the wrong son. [Gen fic, eventual shipping will ensue]