Shadows House Vol 6

From the Yen Press edition

Within a mansion brimming with intrigue, nobles and living dolls alike reside. One such pair, Kate and Emilico, has been singled out by the leaders of the children’s wing as the most likely culprit behind the phantom incident. Given the chance to clear their names, Kate and Emilico set out to discover the true mastermind! However— depending on the results of their investigation—they may gain a new ally if they play their cards right...

Source: Yen Press