Ojou-sama no DokiDoki Daisakusen ~Norowareta Aka no Yakata~ (????????????????????, lit. "The Mistress's Heart-beating Great Operation -The Cursed Scarlet Mansion-") is a fan-made Touhou Project platform action game, developed by BlueMica. It features Remilia Scarlet as the protagonist and Flandre Scarlet as the second protagonist. Saigyouji Yuyuko is also a playable character.

A cybernetics laboratory had finished building the ultimate machine: the nuclear-capable gynoid known as SANA. Mysteriously, a terrorist organization kidnaps SANA and implants her AI with a virus, twisting her mind with a desire to destroy the planet. With the rest of the world unable to act, the special operations miko known as the 'Dichromatic Butterfly' is contracted to counteract …