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The Scarlet Devil Mansion (紅魔館, Koumakan lit. Scarlet Mansion or Scarlet Manor) is the European-style mansion owned by the Scarlet family. It is located on a ridge at the edge Misty Lake. It has relatively few windows for a building its size, which is a beneficial feature, considering that the main residents, Remilia and Flandre Scarlet are vampires. In addition to the vampire sisters, the mansion also houses a large staff working under the Scarlet name. The most powerful staff members are: Hong Meiling, who leads the outer guard; Patchouli Knowledge who acts as the librarian and private tutor; and Sakuya Izayoi, the chief maid who also acts as Remilia's personal attendant.

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Illustration from Perfect Memento in Strict Sense

The interior of Scarlet Devil Mansion is much larger than is appears from the outside. This is due to Sakuya's ability to manipulate time and space.

Scarlet Devil Mansion was the location where a majority of Embodiment of Scarlet Devil took place; Stage 4 took place in the library, Stage 5 and the Extra Stage took place in its hallways, and the Final Stage took place on the rooftop balcony.