In the eerie and opulent mansion known as the Shadows House, faceless, soot-covered nobles known as Shadows live alongside their living dolls, who serve as their ever-present "faces" to the outside world. The story follows Emilico, a cheerful and energetic living doll, who is assigned to serve Kate, a mysterious and noble Shadow. While Emilico navigates the strange rituals and strict social hierarchy of the house with unwavering optimism, Kate harbors a hidden curiosity and a growing desire to uncover the dark secrets that bind their two worlds together. As the pair form a unique bond of trust and friendship, they begin to question the true purpose of the "soot" that powers the mansion and the ominous "debut" ceremony that awaits all young Shadows. Blending gothic mystery with slice-of-life charm, this atmospheric series explores themes of identity, class, and the nature of the soul, creating a hauntingly beautiful fairy tale about finding one's true self in a world of shadows.