Easily one of the most enigmatic characters, despite appearing in so many games, Sakuya is the Chief Maid at the Scarlet Devil Mansion. She works for her mistress, Remilia Scarlet, and is apparently the only human working at or living within the mansion. She has the power to stop time. She is known to then place knives in midair and resume time to allow these knives to fly towards her targets. Stopping time is also a handy way of doing large amounts of maid work in a short time. Because nearly everyone living or working at the mansion are maids, being the chief of them all means there are few people there with more authority within the mansion than Sakuya.
During Embodiment of Scarlet Devil Sakuya attempts to prevent the heroine from reaching her mistress to whom she is very loyal, but fails. Later, during Perfect Cherry Blossom, Sakuya is able to show more of her true character, even if her main reason for trying to solve the problem is that the delayed Spring will affect her too.