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. What dangers and dark secrets will she and Kate encounter, as they become more deeply involved in the inner workings of the shadows' society?