izajoi sakɯja (♫)
Sakuya Izayoi in Unconnected Marketeers
More Character Titles
- "The only human who lives in the house where devils dwell and leader of the maids. A mysterious girl who works in a place that normal humans don't dare approach. Nobody had ever seen her before she started working at the mansion."— Hieda no Akyuu (Perfect Memento in Strict Sense)
Sakuya first appeared as the Stage 5 boss in Embodiment of Scarlet Devil. She appeared in Perfect Cherry Blossom as a playable character and in Imperishable Night as Remilia's partner along with being in the new fighting game Immaterial and Missing Power. Later, she appeared again as a playable character in Phantasmagoria of Flower View, Scarlet Weather Rhapsody and in Touhou Hisoutensoku. She was a playable character once again in Double Dealing Character, and again in Unconnected Marketeers.
She essentially takes the position of managing the Scarlet Devil Mansion. Her height is "tall"; she is taller than Reimu Hakurei and Alice Margatroid but about the same height as Yukari Yakumo and Hong Meiling. She was not born in Gensokyo, and the name "Sakuya Izayoi" was given to her by Remilia Scarlet. In Perfect Memento in Strict Sense, Akyuu guessed that she might have originally been a vampire hunter.
Sakuya tends to be a little spacey, but it's unknown if its just an act. She's polite and pleasant towards to her mistress Remilia Scarlet and those she's close with, such as Patchouli Knowledge, while being less formal with other people. With those she's frequently annoyed with, such as Marisa Kirisame, she can be somewhat harsh and direct with her insults and smack-talk, especially during duels. She seems to possess a wry wit and delivers comebacks stoically.
- In connection with her Age
As for her age, ZUN directly stated that "she plays the role of a human maid about 10 to 20 years old" and "perhaps she is a character in her early teens, and in Perfect Memento in Strict Sense, according to Hieda no Akyuu, "she claims to be in her late teens", but acts with the mannerisms of someone and the level of her ability seems like that of a human that's been living for more than a hundred years. According to a quote from Remilia Scarlet and Sakuya's ending in Imperishable Night (Good Ending #3), Sakuya has been working at the Scarlet Devil Mansion for so long, Remilia doesn't feel it fitting to call her human. With a comment like that, it seems safe enough to assume she has been at the Scarlet Devil Mansion for an extremely long time.
- Manipulating time
Sakuya possesses the ability to manipulate time, where she's able to control the flow of time, such as speeding up time, slowing it down, erasing it, and stopping time altogether. She can also compress the flow of time to make both past and future to exist at the same time, making the same object from different timelines be in many places simultaneously. The extent of her ability lets her not only control the time of the place in which she is, but influence the flow of time of a person, a specific object or even a small zone if she so desires, such as stopping the time of an object and thus affecting the space, making it stand still on thin air or creating time suspension fields where everything inside them will be affected by her ability; she can also accelerate or decelerate the movement of objects from slowed down speed to incredibly high speed, to even reaching the speed of light, making it move at tremendous speed. However, as it is difficult to reverse events that have already occurred, and since she is not able to return broken things to how they were originally even if she reversed time, in reality, it is not possible to reverse time. However, she is able to do things to the extent of moving things back to where they were originally. She has shown the ability to erase time of an object from a respective timeline; such as erasing bullets of the present and then the future, making them non-existent. 
She is also able to manipulate space, and can narrow or lengthen it: she made the Scarlet Devil Mansion, which was originally spacious, even more abundantly spacious, and furthermore just like this she cleans alone. ZUN also said that "Manipulation of Time" is synonymous with "Manipulation of Space". By manipulating space-time, Sakuya is also capable of creating another Sakuya and making it appear in front of her, which will execute a different action to that of the original. This is apparently related to "another time" though it isn't explained thoroughly. 
According to Perfect Memento in Strict Sense, the power to control time is a power that a human can possibly have, but isn't acquired just from just training. In the games, using this ability, she scatters an infinite quantity of knives. To disclose the secret of this trick, she stops time and assiduously collects the knives.
Hieda no Akyuu believes Sakuya has managed to live so long while still looking like a teenager by manipulating time. It's true that Sakuya can increase the speed at which something ages, such as making bamboo flowers bloom instantly in Marisa's A ending of Embodiment of Scarlet Devil, even though this would normally take sixty years. It seems safe enough to assume she can decelerate aging for a specific object, too.
According to Sakuya, her ability to stop time is actually her moving at extremely high speeds with no mass, and she commented that she lacks the ability to stop the progression of someone else's time. While it's possible that this could have been an effort to make Reimu leave and rid the Scarlet Devil Mansion suspicion of kidnappings, there is no way to prove otherwise.
As the head maid, she oversees all the fairy maids as the only human maid. The other maids have many perks to their jobs and rarely choose to leave (even though they are not paid or given vacations); however, they are nearly useless and most of the work is done by Sakuya alone, which would be impossible if she didn't stop or slow time. She shops at the Human Village, but she is cold toward other humans and has no friends there. However, ever since Remilia Scarlet was beaten by the heroine of Embodiment of Scarlet Devil, Sakuya has begun opening herself up more.
At the time of Embodiment of Scarlet Devil, she merely worked at the Scarlet Devil Mansion in return for food. Continuing in Imperishable Night, she did not worry at all about the clothing, food or housing and felt satisfied. Meanwhile, she is utterly devoted to her mistress. She's constantly seeking out new varieties of tea flavours for Remilia to try, as shown in several official works. For example, she mentions in Phantasmagoria of Flower View that with so many flowers around, she can make as much tea and as many pastries as she wants. (Flowers have often been used to provide flavouring for tea, especially in the past, and are still the basis of jasmine tea.)
She possesses a great amount of silver throwing knives and is skilled at handling them, and with only her ability to manipulate time, she is skilled in conjuring knives from nowhere.
Her throwing range is said to be 20 ken (about 36 meters or 39.8 yards) and has the accuracy such that she is able to strike an apple on the forehead of a fairy. A portion of her throwing-knife ability is within her cooking ability and therefore is very skilled at cooking as well. She also is able to conjure knives in battle as danmaku as well. In the games, despite Sakuya showing to make knives appear mysteriously when time is stopped, her artwork in The Grimoire of Marisa shows that she's placing the knives physically.
ZUN has stated in his e-mails that Sakuya is not her real name and that she is not from Gensokyo. According to her profile in Embodiment of Scarlet Devil, her power to control time distanced her from humans, and she eventually gave up trying to be friendly with them.
It is unknown how she came to work for the Scarlet Devil Mansion.
Her full name is Sakuya Izayoi (十六夜 咲夜), which was given to her by Remilia Scarlet. The characters for Izayoi (十六夜) literally means "Sixteenth night" (the night just after that of the full moon), and Sakuya (咲夜) literally means "Flowering night". The Japanese word for "last night" (昨夜) can also read as Sakuya, which would point towards the night of the full moon. The word for "night of the new moon" (朔夜) can also read as Sakuya, which is possibly related to the ability to manipulate time. The word Izayoi (十六夜) has come to mean "sixteenth night" from the expression "izayou tsuki" (いざよう月), where "izayou" means "not to progress/proceed forward at all", which might have a deep connection to her ability as well.
Sakuya was first seen in Embodiment of Scarlet Devil. In this game, she was seen with bright red eyes, silver hair worn in long braids on both sides of her face with green bows at the ends and a white maid headband. She wears a pink/white and dark blue French maid's outfit with an apron, short sleeves and a green ribbon. She is also seen carrying three knives and the phrase "Red Magic" appears to be embroidered on her left sleeve.
Later in Perfect Cherry Blossom, when choosing a player, Sakuya appears to have grey eyes, blue colored long sleeves and a red scarf. She also has red shoes and two knives, one blue and one red. However, her appearance in-game shows her having blue eyes. She's wearing such clothing because it was effectively winter during the game.
Her appearances in Immaterial and Missing Power, Imperishable Night and Scarlet Weather Rhapsody are very similar. Sakuya is seen with grey eyes and once again wearing short sleeves. She appears to the have a thin black ribbon on the maids outfit. However in Imperishable Night she holds a knife and an old stopwatch, where as in Scarlet Weather Rhapsody, she has three knives and a plate with cups and a teapot on it. The colour of her eyes changes with each work.
In Phantasmagoria of Flower View, she has dark blue eyes and long sleeves. The Roman numerals for I (1) through XII (12) line the bottom of her apron.
- Alternative Outfits
Her alternative outfit in Immaterial and Missing Power and Scarlet Weather Rhapsody is mainly light blue with a white apron and her hair is light green. In Phantasmagoria of Flower View, her outfit is mainly dark red instead of dark blue.
Sakuya Izayoi is a character that holds a few mysteries. These are theories among the fanbase about the Touhou Project that may or may not be true in most cases. This section concerns well-known mysteries in relation to Sakuya Izayoi. These are to be noted to only use official material, and a caveat can be suggested to be conjectures in most parts. Hieda no Akyuu states there are several theories regarding Sakuya's origins and/or behaviour (including she is a homunculus, a zombie, or an eccentric).
ZUN's E-mails has referred to her as human, as do most of her official profiles. In Perfect Memento in Strict Sense, Hieda no Akyuu considers Sakuya as a human, but wonders if she is not actually from Gensokyo, but perhaps one of many other worlds including Higan, the Netherworld, the Lunar Capital, and the outside world. Reimu Hakurei questions her humanity in Embodiment of Scarlet Devil, but throughout the series Sakuya insists and refers to herself as a human very often. Perfect Memento in Strict Sense states her ability to control time is an extremely powerful ability for a human to possess.
In relation to Sakuya's eyes being red
In Embodiment of Scarlet Devil, and possibly Immaterial and Missing Power and Scarlet Weather Rhapsody's spell cards, there are parts when her eyes become red when using a spellcard. In Embodiment of Scarlet Devil, it may possibly be due to the Scarlet Mist Incident, but it was inferred that those were to manipulate the eyes of insanity. In Imperishable Night, at the scene where Remilia Scarlet worried that Sakuya might become insane at the time Kaguya cast the light of the true full moon, even when Sakuya looked at the true full moon there did not seem to be any abnormality caused by the full moon. However, Imperishable Night's Good Ending #3 indicates Sakuya went a bit mad. Additionally, ZUN drew Sakuya with red eyes shortly after the release of IN, and answered a fan's question about her red eyes in the picture, stating that they should play through the game to understand. The implication here is that Sakuya did indeed go mad. That being said, Reimu Hakurei and Marisa Kirisame passed through seeing the moon just fine, although they had their own reasons as to why they don't become insane. Either way, Sakuya acts completely normal anyway after IN.
Sakuya being a vampire hunter is a theory that's speculated by Akyuu, based on the fact that her silver knives are the same kind used to slay vampires and other demons. Silver is one of the prime weaknesses of vampires.
The theory that was said by Akyuu claims that long ago, a young vampire hunter was training herself, defeating smaller demons in an unknown location, but never had the chance to fight a vampire. Confident in her abilities, she decided to set out on a journey to slay vampires and ended up at the Scarlet Devil Mansion. There she saw Remilia Scarlet, who was surprisingly strong, and Remilia easily defeated her. However, Remilia wanted the girl's power for herself, so she spared her life and gave her a new name, which also gave her a completely opposite fate: Sakuya Izayoi. Sakuya then became the head maid of the Scarlet Devil Mansion before it was moved to Gensokyo. This may also have some relation to her species theory.
Sakuya's involvement in the human cuisine of the Scarlet Devil Mansion is pretty heavily implied. While Sakuya has never been shown preparing humans, it's stated that all other maids in the mansion are practically useless and Sakuya is the one who does all the work. This heavily implies that she is involved in cooking as well since it's one of the biggest duties in a household.
Flandre Scarlet confesses to Reimu Hakurei in Embodiment of Scarlet Devil that she has no idea who prepares her human food, but doesn't think it's Remilia. Her profile confirms the pastries she eats are made from humans, but doesn't say who prepares the pastries.
Music comments in Embodiment of Scarlet Devil by ZUN state that Remilia's tea is blood. In Strange and Bright Nature Deity, Sakuya asked Remilia if she thought her latest (not humans) tea tasted like blood. Also, Sakuya's ending in Immaterial and Missing Power mentions that tea time is usually "red tea".
In Wild and Horned Hermit Chapter 11, Sakuya comments at the flower viewing party, "It's been a while since I've seen such seedy-looking food. I usually see steaks dripping with blood."
In chapter 35 of Wild and Horned Hermit, faced with Reimu's accusation that she's the one behind the sudden disappearances of the Human Village people because of Remilia's need for blood, Sakuya jokes that it didn't occur to her to kidnap people that way and then denies her involvement in the case on the basis that the kidnapped people come back unharmed the next day with no recollection of what they were doing during that time, stating that her time manipulation powers cannot stop the flow of time for people other than herself.
- the Embodiment of the Scarlet Devil
During Embodiment of Scarlet Devil Sakuya attempts to prevent the heroine from reaching her mistress, but fails.
Sakuya is cleaning when Reimu interrupts her and demands Sakuya to bring her to her mistress. Sakuya refuses to put Remilia in danger and faces against Reimu.
Sakuya is cleaning when Marisa comes in and muses at Sakuya's maid position. Sakuya deadpans about Marisa's magician class and after a rather amusing discussion on Marisa "application", the ruse is uncovered and they fight.
- Perfect Cherry Blossom
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. Sakuya wants no distractions and to quickly find the culprit, unfortunately for her, she gets into a full fledged adventure.
- Imperishable Night
Remilia gets fed up at Sakuya's inability to catch her subtle hints to fix the Moon. Sakuya faithfully follows her disgruntled mistress into the night.
- Phantasmagoria of Flower View
Sakuya wanders about but this time more for her inquiring nature rather than actually solving the incident.
- Double Dealing Character
Sakuya discovers that some of her silver knives started acting up and have become independent. Meanwhile, youkai at the Misty Lake have been running a rampage, so Sakuya goes out to test her new knives.
- Unconnected Marketeers
In Unconnected Marketeers, Sakuya was ordered by Patchouli to investigate the ability cards in order to purchase some for her mistress, Remilia. Eventually, she invites Chimata Tenkyuu to the Scarlet Devil Mansion, where she holds a special market in Remilia's honour.
- Immaterial and Missing Power
Sakuya realizes the air is charged with some strange power and investigates on what could it be.
- Shoot the Bullet
- Scarlet Weather Rhapsody
During the events of Scarlet Weather Rhapsody, she is initially commanded by Remilia Scarlet to find possible suspects behind the strange weather. After Remilia grows tired of "questioning" suspects, she orders Sakuya to personally find and deal with the culprit. After doing so, Sakuya tells Reimu where to find the culprit, and latter helps to rebuild the Hakurei Shrine after it is destroyed for the second time.
- Touhou Hisoutensoku
If connecting SWR with Touhou Hisoutensoku, then Sakuya can become a selectable character to play with, although she appears in no scenarios.
- Hopeless Masquerade
- Impossible Spell Card
After apparently reading the newspaper by the tengu about a mischief-making amanojaku, she becomes one of the many strong youkai and humans to try and stop Seija Kijin. She uses spell cards that are considered impossible to dodge.
- 100th Black Market
In 100th Black Market, Sakuya appears as the one of the 4th market bosses. She has two ability cards dedicated to her, both pertaining to throwing knifes.
The article reports of Sakuya sneaking into Marisa Kirisame's house and stealing various objects with the intent of building a rocketship to travel to the moon. Sakuya explains her odd behavior by claiming she is only carrying out Remilia's request.
In the interview, Aya Shameimaru asks to speak to Remilia to find out why she wanted those items, but in stalling Sakuya, she is late in delivering tea to Patchouli Knowledge, who arrives to see what the hold-up is. Patchouli explains that they were going to use the items for a magic spell which would send them to the moon, but it ultimately proved useless in the end. The interview ends with Sakuya inviting Aya to join them for tea-time.
Sakuya is ordered by Patchouli to gather information on how to construct a "Saturn V Rocket" that would be able to bring Remilia to go to the Moon. After receiving information from Rinnosuke Morichika on its construction, she visited the Hakurei Shrine to convince Reimu Hakurei to help "fuel" the "rocket" by lending a God's strength.
Remilia reacts to Reimu's new event of Mamemaki for Setsubun (an event where people throw beans to drive away the onis) and decides to make her own festival without the beanthrowing in which Sakuya aids with the preparation. Kasen learns that the vampire is also weak against beans and decides to pay them a visit in which Sakuya kindly welcomes her and tell her about the festival. After Reimu's change of mind, the Scarlet Devil Mansion cancels its own festival and sets up a sushi stand at the Hakurei Shrine.
Sakuya goes to the Hakurei Shrine looking for Remilia's new pet, a supposed Tupai, which seems to have disappeared. Later, she goes along with Reimu to Suzunaan to research about the creature. After Hieda manages to capture it and reveal it was actually a Chupacabra, Sakuya returns it to the Scarlet Devil Mansion.
Sakuya is taken possessed by Mizuchi Miyadeguchi who used her in order to send Patchouli Knowledge in to a coma. Rin Kaenbyou and all Scarlet Devil Mansion residents suspected Sakuya as the culprit, which caused them to lock Sakuya in to the basement with Flandre Scarlet, however, Flandre eventually let her out of the basement by destroying the lock on the door. Sakuya went to do the dishes immediately after being let out, at the same time however, Hong Meiling was put in to a coma by Mizuchi, which naturally caused everyone to suspect Sakuya again. Seeing as the investigation is not moving forward, Rin calls her master Satori Komeiji to take over. She finds out that it was indeed Sakuya who caused Patchouli to fall in to a coma due to being possessed by Mizuchi.
As a playable character in several games, Sakuya has met a large number of characters. Generally, she treats everyone with professional politeness fitting of a perfect and elegant maid, but youkai that get in her way while she is resolving incidents are coldly exterminated.
Residents of the Scarlet Devil Mansion
Sakuya is loyal to Remilia Scarlet and serves her as the Head Maid without question, a servitude in which no one knows why either trust each other so much. She follows Remilia's requests even when she knows it won't work, such as catching Lily White to restore Spring in Strange and Bright Nature Deity, as requested by her mistress. When Remilia playfully criticizes Sakuya for her failure to catch spring, she takes it in good stride and doesn't disagree. She will also do things for Remilia which she won't even ask, like accompanying her in Imperishable Night and Immaterial and Missing Power (or trying to, in the latter case), or putting on a sleight-of-hand magic show for Remilia without warning in Curiosities of Lotus Asia. Remilia has said that Sakuya is an excellent cleaner, though not before contrarily stating that humans are useless. On occasion, she's more a babysitter than a maid. She chastises Remilia in her Scarlet Weather Rhapsody and Immaterial and Missing Power victory quotes for sneaking out food or playing around too much.
Hong Meiling is a fellow employee who she pesters about her work productivity as shown in Immaterial and Missing Power and Touhou Hisoutensoku victory quotes. Meiling seems easily frightened when Sakuya shows even a slight bit of anger as shown in Strange and Bright Nature Deity. However, in Meiling's Touhou Hisoutensoku ending, when Meiling is found passed out and asleep, Sakuya takes Meiling inside because she is worried Meiling will get heatstroke.
She also serves Patchouli Knowledge since Patchouli rarely leaves her room. Sakuya has the highest authority as chief maid, yet Patchouli's rank is noticeably higher within the Scarlet Devil Mansion. Sakuya may also be serving her because Patchouli is Remilia's friend, though she does care for Patchouli personally. In Silent Sinner in Blue, she takes a private moment to watch and smile at Patchouli, who's blissfully unaware as she's researching a new magical breakthrough.
On top of serving Remilia, she serves her younger sister Flandre Scarlet, who usually stays in the Scarlet Devil Mansion due to her lack of control over her strength. Someone prepares Flandre's food, which are humans prepared in the shape of pastries and other pleasant things, and although not directly stated, it has to be Sakuya.
As the head maid, Sakuya has precedence over all the other Fairy Maids of the Scarlet Devil Mansion. She is familiar with every each one and notices any abnormality such as the Three Fairies of Light dressing up as three maids. Due to the poor work productivity of the fairies, Sakuya presumably does most of the work. An advertisement in Bohemian Archive in Japanese Red states that Sakuya interviews for recruiting, so she may have interviewed the majority (if not every) of fairy maids herself.
Despite Marisa Kirisame's tendency to "borrow" books from the library, Sakuya has shown on a few occasions (mainly endings) to be quite friendly with Marisa, going so far as to serve her snacks and tea and hiding her from Patchouli. This may explain Patchouli's low "catness" rating in Immaterial and Missing Power.
Residents of Eientei
From the events of Imperishable Night, Sakuya is one of the few people who know that Eirin Yagokoro and Kaguya Houraisan are from the moon, and presumably keeping it a secret. Eirin's profile states Eirin is surprised to see Sakuya, but only Eirin knows why.
ZUN's only hint in regards to this can be seen above in the section about Konohana-Sakuyahime.
Sakuya met them in an omake in Eastern and Little Nature Deity, where she stops their prank by throwing some knives at them. In Strange and Bright Nature Deity, at the mansion, she saw through their maid disguises but didn't say a word and let them stay. She eventually kicked them out (according to the fairies' conversation) or frightened them out by telling them if they don't work, they don't eat. Sakuya was smiling, so she may have been speaking as-a-matter-of-factly.[ ] Later, when they're spying on Sakuya and others at the Hakurei Shrine, she sees them, revealing she can see through their abilities to hide themselves even though Reimu Hakurei and Marisa Kirisame cannot. She cheerfully invites them to join, but this only scares them into running away, which disappoints her.
In Immaterial and Missing Power she gets lost in the Forest of Magic and Alice escorts her out. Also, she fights Alice as a way to relieve stress on her break. In Scarlet Weather Rhapsody, Sakuya is ordered by Patchouli to kick Alice out. In both cases, Alice thought it was a poor reason. In comparison, Marisa Kirisame and Youmu Konpaku don't even get into trouble when caught intruding in the mansion (in fact, they usually get tea, instead).
Sakuya has trouble understanding why Cirno finds freezing frogs or flowers fun in Phantasmagoria of Flower View, but at least came to understand fairies' recklessness from watching Cirno fight in Touhou Hisoutensoku. Cirno does not want to be a fairy maid.
Sakuya on the Vol. 5 cover of Wild and Horned Hermit
Sakuya in the Strange Creators of Outer World Vol. 2 cover
Sakuya full artwork from Embodiment of Scarlet Devil
Sakuya artwork from Embodiment of Scarlet Devil
Sakuya artwork from Perfect Cherry Blossom
Sakuya artwork from Immaterial and Missing Power
Sakuya artwork from Imperishable Night
Sakuya artwork from Phantasmagoria of Flower View
Sakuya artwork from Scarlet Weather Rhapsody
Sakuya artwork from Touhou Hisoutensoku
Sakuya artwork from Double Dealing Character
Sakuya artwork from Unconnected Marketeers
Illustration of Sakuya in Bohemian Archive in Japanese Red
Another illustration of Sakuya from Bohemian Archive in Japanese Red
Sakuya from Who's Who of Humans & Youkai - Dusk Edition
Sakuya in Strange and Bright Nature Deity
Sakuya and Remilia cameo in Extra of the Wind
Sakuya mummy costume in Oriental Sacred Place
Sakuya in Lotus Eaters
Sakuya's sigil in The Grimoire of Marisa
Sakuya's sigil from Touhou Hisoutensoku
Omikuji with Sakuya's portrait made by ZUN for Reitaisai 15
Sakuya's job hiring ad from Alternative Facts in Eastern Utopia
Sakuya's shot type on an Ability Card from Unconnected Marketeers
- Despite helping rebuild the Hakurei Shrine later in Scarlet Weather Rhapsody, Sakuya casually ignores Reimu Hakurei's donation requests for shrine upkeep in Immaterial and Missing Power, saying she doesn't believe in gods anyway. She also describes herself as being as an atheist when Reimu asks her about disappearances in the Human Village in Wild and Horned Hermit.
- Some people note that Sakuya has stated that she is an "atheist" on multiple occasions, such as in Wild and Horned Hermit, despite living in a land where Gods are literally real. However, within context, Sakuya simply seems to mean she does not believe that the Myriad Gods, who represent nature, are "divine" and worthy of worshipping.
- Her alternate colors in Immaterial and Missing Power and Scarlet Weather Rhapsody might be a homage to Ruukoto, the first maid of the Touhou Project. In Touhou Hisoutensoku more alternate palettes were added, including a possible reference to Suigintou and Dio Brando.
- Similar to most humans in Gensokyo, Sakuya seems to lack knowledge of basic scientific concepts (such as the concept of oxygen), as seen in both Silent Sinner in Blue and her route in Unconnected Marketeers.
- Theoretically, Sakuya is the fifth character to serve as a maid in the Touhou Project. The other maid characters are Ruukoto, Mugetsu, Yumeko and Alice Margatroid. However, due to the fact that Mugetsu is probably not a maid, Sakuya would be the fourth maid in the Touhou Project.
- Shibata Masahiro's manga series "Sarai" seems to be a big inspiration for many of the characters from EoSD . Sarai is a manga about superpowered maids fighting youkai and monsters in a dystopian future. The series was published from 1997 to 2007 in Japan only.
- Sakuya's design resembles that of Flicker and Nudge from Sarai and all of them are maids. Sakuya resembles Nudge more appearance wise (with the exception of Eyeglasses) while Flicker uses Knives as a weapon just like Sakuya. The comparison between Sakuya, Nudge and Flicker.
- Embodiment of Scarlet Devil Reimu's scenario - Patchouli Knowledge:"There is someone in the mansion who likes to mess with space."
- Perfect Memento in Strict Sense Sakuya's article - "In addition, her ability can be used to manipulate space, as well." Space and time are largely the same thing.
- Embodiment of Scarlet Devil Omake.txt - "5th stage boss. Plays the role of a human maid about 10 to 20 years old."
- Imperishable Night (Good Ending #3)
- Perfect Memento in Strict Sense: Sakuya Izayoi
- 『三月精 第2部』「上海アリス通信 三精版 第5号」（『月刊コンプエース』Vol.7 p.275。実質的には「第6号」なのだが誤植で「第5号」になっている。単行本未収録）
- ZUN's E-mails
- Embodiment of Scarlet Devil: おまけ.txt
- インターネットラジオ「萎えラジDNA コミケット72直前スペシャル」（2007年8月11日放送）でのZUNの発言
- Imperishable Night - "Deflation World"
- The Grimoire of Marisa - Sakuya Izayoi's Spell Cards
- Curiosities of Lotus Asia: Chapter 4–5
- Double Dealing Character
- ZUN's reply to messages on the former Gensou Bulletin Board 2
- "Alternate Skill Cards - Time Paradox"
- Wild and Horned Hermit: Chapter 35
- Imperishable Night: キャラ設定.txt
- Imperishable Night: Manual
- ZUN's reply to messages on the former Gensou Bulletin Board 1
- Perfect Cherry Blossom: Manual
- Immaterial and Missing Power: 上海アリス通信.txt
- Perfect Memento in Strict Sense/Vampire
- Cage in Lunatic Runagate Chapter 7
- Immaterial and Missing Power Sakuya's Scenario: "Too bad. I don't believe in gods."
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