In the realm of Reven, a new monarch's ascension triggers a sudden economic downturn. Lydia, unable to afford her ailing mother's medication, receives an unexpected act of generosity from a stranger. Eager to reciprocate, she becomes a maid for the enigmatic Lord Evert Drake, a controversial figure in the political arena. During a trip to town, Lydia intervenes to save Shiki, a speechless girl, from a dire fate, leading to a bond between them. When Shiki thwarts an assassination aimed at Lord Evert, she gains a place among his household staff. A mysterious voice overheard by Lydia sparks her curiosity, focusing her suspicions on Shiki, the only silent girl in their midst. Determined to unravel this enigma and delve into Lord Evert's obscure history, Lydia embarks on a quest to reveal the secrets concealed within the walls of their estate.