One day, while walking through the Forest of Magic, you heard quick footsteps. Although you might have thought it was an enemy about to attack you, a few seconds later a little girl, looking frightened, ran out of the bushes. She looked human, which was rather surprising. What was a human child doing in the Forest of Magic? Shouldn't she be in a human village? Something was obviously wrong with her, but that didn't stop you from taking her into Scarlet Devil Mansion.

Although Lady Remilia was initially reluctant to take a human into her mansion, as vampires, youkai, and fairies still lived there, making it quite dangerous for a child. However, you managed to convince her to let Sakuya live there, and thus Sakuya Izayoi became your adopted child.

During her training, it was revealed that she had the ability to stop time, which is why she was expelled from the human village.

Walking through the corridors of the mansion, you entered the living room and saw Sakuya reading a book, which, judging by the cover, talks about the rules of etiquette and such.