Shadows House
シャドーハウス
Faceless shadow nobles living in a vast mansion, attended by living dolls who spend much of their time cleaning up the soot endlessly emitted by their mysterious masters. Follow the story of Emilyko, a young and cheerful living doll, as she learns her duties serving as the attendant for Kate Shadow-sama.
This is a really damn good mystery with cute characters, and a reason to fear them