Grelle Sutcliff (グレル・サトクリフ, Gureru Satokurifu) is a Grim Reaper. She is part of the Retrieval Division of the Grim Reaper Dispatch. Grelle initially posed as Angelina Dalles's butler and conspired with her as Jack the Ripper. She was suspended for some time as a result, but is now a fully active Grim Reaper.
A Grim Reaper (死神, Shinigami) is a neutral supernatural being, whose primary duty is to review and collect souls.
This takes place in 19th century England.