Sakuya Izayoi is the head maid of the Scarlet Devil Mansion. She occasionally goes to the Human Village on errands for Remilia. What kind of self-indulgent request did the mistress give her? And what kind of extravagant meal is she going to cook?

Sakuya's cooking is extremely lavish. She brought a multitude of dishes to the Hakurei Shrine for the flower viewing party. She also prepared good quality wine and went to offer some to Reimu... but let out a deep sigh upon seeing Reimu shout, "Nothing beats good sake, right?!" to Suika.

You can tell by how they interact with each other that Sakuya is definitely not being forced to work by Remilia. Her occasional reprimands show that she has considerable authority within the Scarlet Devil Mansion.

During the Kosuzu Motoori Case Files incident, Sakuya visited Suzunaan with the task of finding something for Remilia. She says that she's looking for a "rare book"―but whatever for? Detective Patchouli and Detective Kosuzu hurry to the Scarlet Devil Mansion to find out.

Suspicion is cast over Sakuya, as her ability to manipulate time could make it possible for her to steal Akyuu's book. Sakuya pairs up with Remilia in a battle of bullets to clear her name...