Also known as: 紅魔館, 红魔馆, Koumakan
The setting of stages 4-6 and the extra stage of the Touhou game Embodiment Of Scarlet Devil.
The Scarlet Devil Mansion is described as a western-style mansion situated near Gensokyo's Misty Lake. Official depictions are inconsistent on whether the mansion sits on the lake's far side, or on an island in the middle of the lake.
The home of Remilia Scarlet, her sister Flandre, friend Patchouli Knowledge and her little devil, Koakuma, maid Izayoi Sakuya and the Fairy Maid (Touhou)s, and gatekeeper Hong Meiling. Rumia, the fairy duo Cirno and Daiyousei, and the mermaid Wakasagihime, who all live at or near Misty Lake, are also frequently seen in the area.
Known for its immense library, the Voile.