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Kaguya Houraisan

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(ほう) (らい) (さん)   (かぐ) ()
hoːɽaisaɴ kagɯja (♫)
Kaguya Houraisan
Kaguya Houraisan
Kaguya Houraisan in Imperishable Night
Eternal Princess
More Character Titles

Lunarian (not native to Gensokyo)


Manipulation of eternity and the instantaneous


Ageless, existed for at least 1300 years. Stated by ZUN (drunkenly) to be hundreds of millions of years old.[1]


Unknown, currently in hiding, formerly a moon princess.


Eientei, was originally from the Moon

Music Themes
Official Games
Print Works

"The human body houses a fragile, round soul. What those humans live on is a huge, round orb below. And, what the superior people live on... is that lunatic orb behind me."
Kaguya Houraisan (Imperishable Night Stage 6)

Kaguya Houraisan (蓬莱山 輝夜 Houraisan Kaguya) is one of the main antagonists of Imperishable Night. She was once a princess of the Lunarians, a race of people living on the Moon. For the crime of creating the Hourai Elixir, she and Eirin Yagokoro were exiled to Earth, where they came to live in what would eventually become Gensokyo. She is currently the princess of Eientei.

General Information

Kaguya first appeared as the true final boss in Imperishable Night, then appeared as a stage 9 target in Shoot the Bullet. She made a brief cameo in the backstory of Legacy of Lunatic Kingdom.


Kaguya has a rather carefree personality, as she often sneaks out to visit the human village.[2] She apparently is refined in the art of conversation, but her vocabulary is a bit dated.[3] She is also described as haughty and relatively wild.[4]


Manipulating eternity and the instantaneous
Kaguya, as illustrated in The Grimoire of Marisa

Eternity is namely immutability, and it can be said that eternity rejects all change. Things that possess eternity indefinitely do not change, and also cannot be interfered with by things outside of themselves. By using her ability on everything in Eientei, she made it so that living things stopped aging, objects would never break, and food would never spoil.[5] Additionally, beginning from when Kaguya came to Gensokyo, she lived hidden away for a thousand years in the interior of the Bamboo Forest of the Lost without anybody knowing about her. Also, the pure Japanese-style mansion in Eientei can be seen not to have worn out at all, which can be said to have been due to this ability of eternity. After the Eternal Night incident, Kaguya removed the spell of eternity from Eientei, causing objects to break as normal, living things to age again, and food to spoil if not eaten in time.[5]

Incidentally, as the Hourai Elixir made by Kaguya's ability of eternity is something that makes the consumer have a "body that rejects all change," it can simply be said to be a kind of maximised, self-healing ability (due to this, it is said that the entire body can recover from just a single hair left intact, as shown in the case of Fujiwara no Mokou). In the last spell card "End of Imperishable Night" which used this ability, it destroyed Reimu Hakurei and the others' spell of eternity, and forcibly called for dawn (End of Imperishable Night -Rising World-, where "Rising World" was a homophone to "dawn" as "yoake" (夜明け)).

On the other hand, Kaguya, in being able to manipulate the instantaneous, is able to alter the needed "instants" and make them her own time. However, whatever she gathers together—since it is made up of many "unrecognisable instants" that cannot be changed—has no means of being known about. For this reason, in manipulating the instantaneous, Kaguya is able to spend "time the same as others'" and "time different from others'" simultaneously. Hieda no Akyuu presented this as "having parallel timelines at the same time." In the nineteenth chapter of Silent Sinner in Blue, as the instantaneous is the smallest unit of time, time is able to accumulate countless instants. Watatsuki no Toyohime explained that to see time as continuous is due to the inability to recognise the instant.

Since her ability can be said to be the ability to manipulate "complete stop = eternity" and "extreme speed-up = instant", Akyuu also summarised it as an "ability to manipulate time". This seems very similar to Sakuya Izayoi's "ability to manipulate time."


Kaguya on the cover of Cage in Lunatic Runagate

Well over a thousand years ago, Kaguya was born in the royal house of the Moon and was treated with utmost care as a princess. However, due to boredom, and managed to get Eirin Yagokoro to create the Hourai Elixir out of self-interest and consumed it. This was illegal, and she was executed. She was immortal, so despite being executed many times, she could not permanently be killed, so she was exiled to Earth and forced to live among humans as punishment. She was found by a bamboo cutter and dwelt among the humans she had once despised. Though the Lunarians looked upon humans with contempt, Kaguya came to love her new home. She enjoyed her life on Earth for a while without problems, but as rumours of her beauty spread far and wide, she started to feel guilty about it. Tales of her unearthly beauty led men from all across the land to seek her hand in marriage, (Fujiwara no Mokou's father being one of them) but none could successfully complete her trial of the Five Impossible Requests.

The first was to bring her the stone begging bowl of the Buddha from India. The second was to retrieve a jeweled branch from the island of Mount Hourai. The third was to seek the legendary robe of the fire-rat of China. The fourth was to retrieve a colored jewel from a dragon's neck. The final task was to find the legendary Cowry treasure of the swallows. These potent treasures were eventually revealed to already be in Kaguya's possession in the final stage of Imperishable Night.

After years of exile, powerful emissaries arrived from the Moon; Kaguya had been forgiven of her crime and it had been decided that she should return. Kaguya, however, had grown to love life on Earth, which was far more interesting than the life she had on the Moon, and had no desire to return to the Lunar Capital permanently. Even so, Earth was filthy and life on Earth had its share of problems. She was torn between Earth and the moon, but she discovered Eirin to be an emissary. Eirin was apologetic to Kaguya since she was not punished for creating the elixir. Her desire for redemption was so strong that she was ready to do anything for Kaguya, so she decided to live on Earth with her. Eirin betrayed the other emissaries and helped Kaguya escape to what would eventually be Gensokyo. Taking refuge in an ancient manor called Eientei hidden deep within the Bamboo Forest of the Lost, the two Lunarians began a new exile.

Illustration of Kaguya in CiLR

Eventually, the Moon stopped sending emissaries to fetch them; they had forgotten about the past and were living in peace. One day, an event took place that made them recall the past, a century since Gensokyo was sealed. On that day, a self-claimed moon rabbit named Reisen Udongein Inaba ran into their home, who had come because she had heard rumors about Gensokyo. She then stated that humans were invading the Moon, sticking the American flag, on the moon and acting like the moon belonged to them, making it nearly impossible for people of the Moon to live there. The rabbit had escaped from the frontline of a war, leaving her allies behind. Kaguya remembered that she, too, was a Lunarian long ago, and they decided to allow Reisen to live with them. After several centuries of isolation, she was eventually reunited with Mokou, who had also used the Hourai Elixir to become immortal, and the two continued their feud, murdering each other on a nearly daily basis.

A few decades have passed since then. On one night of a full Moon, Reisen received a transmission from other surviving moon rabbits, stating that a new war will be starting soon and Reisen needs to return. She had no intention of going back, so Kaguya and Eirin defended her. However, were they to kill the emissaries, they would have to go into hiding for a long time again. Eventually, Eirin came up with a plan to replace the real Moon with a fake one, thus making it no longer possible to travel between Earth and the Moon. Their only mistake was underestimating the power of Gensokyo's natives, who rely on the power of the moon, which caused the incident of Imperishable Night. In the end, humans and youkai succeeded in dispelling the fake moon, and Gensokyo was already sealed by the Great Hakurei Barrier', so the Lunarians would have been unable to enter Gensokyo to begin with. Kaguya, Eirin, and Reisen were now able to enjoy a peaceful life in Gensokyo without living in constant fear of attack.

Character Design

Kaguya, as illustrated in Perfect Memento in Strict Sense.


Kaguya, and the whole of Imperishable Night, is inspired by the Japanese legend of the Moon Princess, also known as the The Tale of the Bamboo Cutter, sometimes called the legend of "Kaguya-hime" (Princess Kaguya).


Her full name is Kaguya Houraisan (蓬莱山 輝夜). Her first name Kaguya (輝夜), means "shining night", "sparkling night", or "radiant night".

Houraisan (蓬莱山) refers to "Mount Hourai". Mount Hourai (Penglai in Chinese) is the name of a legendary mountain that floats above the sea. Its inhabitants were said to possess, among other treasures, the elixir of immortality. It was also the destination of one of Kaguya-hime's impossible tasks.

Thus, her full name literally means "[a] (shining/sparkling/radiant) night [on] Mount Hourai."


Kaguya is shown to have dark brown eyes and very long black hair in a hime cut style. She wears a pink shirt with many white bows, and a long, dark burgundy skirt decorated in plants and flowers representing the four seasons. Respectively, they are cherry blossoms, bamboo leaf, maple leaf and plum blossoms. Her 5 Impossible Requests are seen floating around her, probably waiting for her order to engage in a spell card attack.



Imperishable Night
Kaguya's sprite in IN

During the events of Imperishable Night, Kaguya had been hidden in a secret pathway along with the true moon by Eirin to ensure any Lunarians sent to recover Reisen Udongein Inaba wouldn't discover her. The heroines of Imperishable Night, however, did discover her, and challenged her to return the full moon to Gensokyo. After being defeated, Kaguya unleashed her powers of eternity in an all-out bid to break the spell of the imperishable night cast by the heroines. Finally she relented and the true moon was recovered.

She now spends her days living in Eientei in a carefree manner, sometimes holding exhibitions of Lunarian treasures there for the rest of Gensokyo to admire. Her long isolation has made her lonely, and she enjoys telling stories to any guests she might receive.

Legacy of Lunatic Kingdom

Kaguya is shown in the backstory of Legacy of Lunatic Kingdom. She knew that the moon rabbits from the Lunar Capital will come to Gensokyo and purify Earth. Kaguya and Eirin both knew that humans cannot compete with the enemy, so Eirin created a medicine just for this occasion.


Shoot the Bullet
Kaguya in HM

In Shoot the Bullet, Aya Shameimaru encountered Kaguya on stage 9 and took photos of her danmaku. Aya notes Kaguya's collection of rare objects while being confounded by some of their appearances.

Hopeless Masquerade

Kaguya made a background cameo appearance in Hopeless Masquerade on the Human Village stage. She's seen sitting with Tewi Inaba, Eirin, and Reisen, where she will occasionally close her eyes and fall asleep.

Antinomy of Common Flowers

In Reisen and Doremy's ending in Antinomy of Common Flowers, Kaguya chastises Reisen for the chaos she caused in various locations around Gensokyo without realizing that the one truly responsible was a fake. Subsequently, Kaguya puts her under house arrest until she can provide evidence of her innocence.

Violet Detector

Sumireko Usami refers to Kaguya as "Gensokyo's secret character" in Violet Detector, noting that she stays cooped up indoors all the time.


Bohemian Archive in Japanese Red
Strange and Bright Nature Deity

Kaguya tries a taste of the sake made by Suika Ibuki's sake bug and notes that it has a very deep, "earthly" flavor. She also appears briefly in moments when the fairies interact with the other residents of Eientei.

Silent Sinner in Blue

Kaguya comments on the strangeness of the Moon lately and discusses with Eirin the potential for a Second Lunar War on the horizon. The two later visit Patchouli Knowledge at the Scarlet Devil Mansion where they confirm Eirin's suspicions that some third party was planning to attack the moon. Later, she and Eirin appear to be deceived into thinking that Yukari Yakumo's plan failed, just as the other Lunarians were deceived.

Cage in Lunatic Runagate

Kaguya is described as being laid-back for a fugitive, but this was not always the case and is perhaps due to her now long and peaceful life. Despite this, she also expresses some distress at the prospect of moon rabbits being put on trial for unconfirmed rumors, and sorrow at the possibility of the Lunar Capital viewing herself and Eirin as potential invaders due to these rumors. Eirin comments that she was naive to believe that the Lunarians would accept her. Kaguya recollects on her realization that trapping Eientei in eternity was unnecessary when seeing how well the humans and youkai got along during the events of the Eternal Night incident. She also notes that she felt jealous seeing their good relations, but she holds no regrets despite not being able to return to the moon. Later, she reminisces on her early days on Earth living with an old human couple and how both she and Eirin came to view Earth's inhabitants as equals to Lunarians despite once viewing them as inferior (much like tools) as other Lunarians do.

Foul Detective Satori

Kaguya first appeared in chapter 12 where she was chatting with Reimu about the vengeful ghost that was targeting her. She simply at first brushed off the topic at hand until she received a threat in a form of a letter. Secretly, she and Eirin planned on using her as bait to lure out the culprit. Unknown to everyone, however, Kaguya was already possessed by the vengeful spirit at that time. Her body was later left in the Bamboo Forest when the culprit possessed Mokou.

Who's Who of Humans & Youkai - Dusk Edition


Eirin Yagokoro

Eirin is Kaguya's servant and friend. She is also the one who made the Hourai Elixir for Kaguya, and when sent to Earth to bring her back on the Moon, she killed the other emissaries and helped Kaguya hide herself. Now she serves Kaguya faithfully within Eientei as its live-in doctor.

Despite finding her to be naive at times, Eirin nonetheless enjoys Kaguya's company as the two relax together during the monthly lunar festivals.[6]

Reisen Udongein Inaba

Reisen is loyal to Kaguya, and Kaguya has been shown to be caring of her as seen in the endings of Imperishable Night and Legacy of Lunatic Kingdom. Despite their good relations, Reisen often ends up being chastised by both Kaguya and Eirin for her mistakes. Additionally, the pair refer to Reisen as a "pet" on more than one occasion and treat her similarly to a regular rabbit at times; it is unknown if this is done in jest or not, however.

Tewi Inaba

In return for letting her live on the land, Kaguya and Eirin freely give her information and technology. They also work in tandem with each other on certain plans such as ones shown in Wild and Horned Hermit.

Fujiwara no Mokou

Mokou and Kaguya seem to have a mutual rivalry. The two fight, compete, and even kill each other for fun and to alleviate the boredom of eternal life. In Imperishable Night, Kaguya sends the player characters to fight with Mokou, calling it a "trial of guts."

Although their rivalry is usually thought to be serious, Mokou has expressed care for Kaguya (though unbeknowst to her). [7] Outside of their continuous rivalry, Mokou and Kaguya hang out at the village when Kaguya is able to sneak out of Eientei.[8]






Spell Cards

Spell Cards
Name Translated Comments Games Stage
Total: 38
難題「龍の頸の玉 -五色の弾丸-」 Impossible Request "Jewel from the Dragon's Neck -Five-Colored Shots-" IN St. 6B: E/N
神宝「ブリリアントドラゴンバレッタ」 Divine Treasure "Brilliant Dragon Bullet" IN
St. 6B: H/L
難題「仏の御石の鉢 -砕けぬ意思-」 Impossible Request "Buddha's Stone Bowl -Indomitable Will-" IN St. 6B: E/N
神宝「ブディストダイアモンド」 Divine Treasure "Buddhist Diamond" IN
St. 6B: H/L
難題「火鼠の皮衣 -焦れぬ心-」 Impossible Request "Robe of Fire Rat -Unhurried Mind-" IN St. 6B: E/N
神宝「サラマンダーシールド」 Divine Treasure "Salamander Shield" IN
St. 6B: H/L
難題「燕の子安貝 -永命線-」 Impossible Request "Swallow's Cowrie Shell -Everlasting Life-" IN St. 6B: E/N
神宝「ライフスプリングインフィニティ」 Divine Treasure "Life Spring Infinity" IN
St. 6B: H/L
難題「蓬莱の弾の枝 -虹色の弾幕-」 Impossible Request "Bullet Branch of Hourai -Rainbow Danmaku-" IN St. 6B: E/N
神宝「蓬莱の玉の枝 -夢色の郷-」 Divine Treasure "Jeweled Branch of Hourai -Dreamlike Paradise-" IN
St. 6B: H/L
「永夜返し -初月-」 "End of Imperishable Night -New Moon-" IN St. 6B: E
「永夜返し -三日月-」 "End of Imperishable Night -Crescent Moon-" IN St. 6B: N
「永夜返し -上つ弓張-」 "End of Imperishable Night -1st Quarter's Moon-" IN St. 6B: H
「永夜返し -待宵-」 "End of Imperishable Night -Matsuyoi-" IN St. 6B: L
「永夜返し -子の刻-」 "End of Imperishable Night -11 o' Clock-" IN St. 6B: E
「永夜返し -子の二つ-」 "End of Imperishable Night -Half to Midnight-" IN St. 6B: N
「永夜返し -子の三つ-」 "End of Imperishable Night -Midnight-" IN St. 6B: H
「永夜返し -子の四つ-」 "End of Imperishable Night -Half Past Midnight-" IN St. 6B: L
「永夜返し -丑の刻-」 "End of Imperishable Night -1 o' Clock-" IN St. 6B: E
「永夜返し -丑の二つ-」 "End of Imperishable Night -Half Past 1-" IN St. 6B: N
「永夜返し -丑三つ時-」 "End of Imperishable Night -Dead of Night-" IN St. 6B: H
「永夜返し -丑の四つ-」 "End of Imperishable Night -Half Past 2-" IN St. 6B: L
「永夜返し -寅の刻-」 "End of Imperishable Night -3 o' Clock-" IN St. 6B: E
「永夜返し -寅の二つ-」 "End of Imperishable Night -Half Past 3-" IN St. 6B: N
「永夜返し -寅の三つ-」 "End of Imperishable Night "4 o' Clock" IN St. 6B: H
「永夜返し -寅の四つ-」 "End of Imperishable Night -Half Past 4-" IN St. 6B: L
「永夜返し -朝靄-」 "End of Imperishable Night -Morning Mist-" IN St. 6B: E
「永夜返し -夜明け-」 "End of Imperishable Night -Dawn-" IN St. 6B: N
「永夜返し -明けの明星-」 "End of Imperishable Night -Morning Star-" IN St. 6B: H
「永夜返し -世明け-」 "End of Imperishable Night -Rising World-" IN St. 6B: L
「蓬莱の樹海」 "Hourai's Sea of Trees" IN LW
新難題「月のイルメナイト」 New Impossible Request "Lunar Ilmenite" StB St. 9
新難題「エイジャの赤石」 New Impossible Request "Red Stone of Aja" StB St. 9
新難題「金閣寺の一枚天井」 New Impossible Request "Seamless Ceiling of Kinkaku-ji" StB
St. 9
新難題「ミステリウム」 New Impossible Request "Mysterium" StB St. 9
永夜符「蓬莱壺中の弾の枝」 Eternal Night Sign "Bullet Branch of Hourai in a Jar" Co-owner with Eirin VD
Nightmare Tuesday - 1
輝夜符「蓬莱の大きな弾の枝」 Shining Night Sign "Big Bullet Branch of Hourai" Co-owner with Shinmyoumaru VD Nightmare Tuesday - 4
緋夜符「蓬莱の弾の要石」 Scarlet Night Sign "Bullet Keystones of Hourai" Co-owner with Tenshi VD Nightmare Tuesday - 6

Additional Information

  • A silhouette of Kaguya occupies the front of Imperishable Night's jewel case.
    • Kaguya is the first Windows era final boss character who appears on a Touhou main game's jewel case.
  • Kaguya has a larger spell card arsenal than either Remilia Scarlet or Yuyuko Saigyouji and attacks confidently and without hesitation in combat.
  • It can be conjectured that Mokou and Kaguya's rivalry symbolizes for the cycle of the Sun and the Moon: Kaguya, the Lunar Princess, and Mokou, who uses as an in-game avatar a fire bird that strongly resembles a phoenix.
  • To prevent boredom, Kaguya tends to a bonsai tree daily.[5]
  • Kaguya was planned to debut as a playable character in Touhou Hisoutensoku, but the plot involving her and Mokou was eventually scrapped.[9]


Official Profile

Imperishable Night - キャラ設定.txt
Kaguya Houraisan IN

 ○最終ボス 永遠と須臾の罪人

蓬莱山 輝夜(ほうらいさん かぐや)
Kaguya Houraisan





































○Last Boss, The Sinner of Eternity and the Instantaneous

Kaguya Houraisan

Species: Lunarian
Ability: Manipulating eternity and the instantaneous

Kaguya (カグヤ) was born in the royal house of the moon and was treated with utmost care as a princess. Because of that, she grew very selfish... But one scandal changed her life. She had Eirin make the Hourai Elixir - a forbidden medicine - out of self-interest and consumed it.

The crime was soon discovered and Kaguya was executed for it.

However, possessing the power of eternity, Kaguya immediately resurrected upon dying, so effectively she could not die. For Kaguya's punishment, she was exiled to Earth and forced to live among filthy humans. Soon afterward, she was found by an old human male, and began life as Kaguya-hime...


Kaguya is a former Lunarian who was expelled from the moon. She enjoyed her life on Earth for a while without problems, but as rumours of her beauty spread far and wide, she started to feel bad about it.

A few years later, she was allowed to return to the moon, but she really didn't want to. She had become attached to people who she were living with and preferred life on Earth, which was far more emotional than the life she had on the moon. Even so, Earth was a bit filthy and life on Earth had its share of problems. She was torn between Earth and the moon... It was then that she found a familiar face among the emissaries from the moon. It was Eirin.

Eirin felt very sorry for Kaguya because she wasn't punished even though she was the one who made the elixir. Her desire for redemption was so strong that she was ready to do anything for Kaguya, so she decided to live on Earth with Kaguya.

Eirin betrayed the other emissaries and helped Kaguya escape. The two of them began to live in desolate place. It was so desolate that it was haunted by youkai...


A long, long time has passed since then.

The moon was no longer sending emissaries to fetch them; they had forgotten about the past and were living in peace.

One day, an event took place that made them recall the past.

It had been more than a century since Gensokyo was cut from the human world. They were living quietly without meeting anyone. On that day, a rabbit ran into their home. She claimed to be a rabbit from the moon who had come because she heard rumours about Gensokyo, a place where non-humans live. She then said, "humans are invading the moon and it's becoming nearly impossible for people of the Moon to live there. These humans stuck a flag on the moon and are acting like the moon belongs to them".

The rabbit had escaped from the front line of a war, leaving her allies behind...

Kaguya remembered that she, too, was a Lunarian long ago.

Humans were invading the moon? That's ridiculous...But the rabbit seemed to be telling the truth. Anyway, they decided to allow that poor rabbit - Reisen - to live with them.

A few decades have passed since then.

Kaguya, Eirin and Reisen were enjoying their peaceful life. Gensokyo makes everyone easy-going and peaceful... It really was like a paradise.

On one night of a full moon, Reisen received a transmission from other surviving moon rabbits. (Moon rabbits have some kind of telepathic ability and can communicate across great distances.) It said:

"These filthy humans are exploiting the power of the moon and trying to build a base here. We've been urging them co-exist peacefully with us, but they never listen. We're up against a wall.

"We've decided to declare a final war against them. The tide of war is currently slightly in their favour... Their modern weaponry is far better than we expected. But don't worry, we have the wisdom and pride of our millennia of history... We will never lose.

"Dear Reisen, a war will be starting soon. Please come back and fight at our side.

"Also, please tell the humans you're living with... That we're coming to take you back with us on the next full moon. Refusal is not an option."

Reisen told them that she needed to return to the moon, but... Kaguya and Eirin were part of the Lunarian race as well.

Kaguya remembered her past. A past of innocence. A life of living with humans. A memory of murdering emissaries and going into hiding.

Kaguya had a discussion with Eirin, then decided to not return Reisen to the moon, which would result in killing the emissaries and relocated their home. Thus they would have to return to going into hiding again. However, Kaguya got sick and tired of doing such thing so she consult Eirin if there was a way to drive away the emissaries while being able to live on Earth with dignity.

Just as Kaguya was about to finish speaking, Eirin presented her solution.

"If we remove the full moon from Earth, then the path between Earth and the Moon will be closed. A full moon from Earth is what makes it possible for them to come here. That's why the Lunarians only visit on nights with a full moon. If we corrupt that full moon... Earth will become a large, sealed chamber."

Thus, they hid the true moon from Earth, replacing it with a fake moon that will never be full.

It was no longer possible to travel between Earth and the Moon.

Their only mistake was that they had not expected the power of the youkai, who rely on the power of the full moon, to be this powerful.

In the end, humans and youkai succeeded in dispelling the fake moon. But that wasn't a problem... Gensokyo was already sealed by the Hakurei border, so the Lunarians wouldn't have been able to enter Gensokyo to begin with.

Kaguya, Eirin and Reisen have come out of hiding and are living freely in Eientei.

So, what was the outcome of the Moon War? That didn't matter to Kaguya anymore; Gensokyo is now her home...

Kaguya 蓬莱山 輝夜(ほうらいさん かぐや)


Kaguya Houraisan
Lunarian/Ability to manipulate eternity and the instantaneous

The former princess of the moon, living in Eientei, deep in the bamboo forest.
For someone brought up as a princess, she has a relatively wild personality.
In the past, she became immortal from consuming the forbidden medicine that Eirin made, the "Hourai Elixir", out of curiosity, and because of that she was exiled from the moon.

Official Sources

Official sources


  1. A castle to return to - booklet: 原作者ZUN氏に聞いたところ(酔っぱらった時に聞いた答えだが)、永琳や輝夜の年齢は億単位だそうだ。
  2. Foul Detective Satori - Chapter 16
  3. Perfect Memento in Strict Sense - Kaguya
  4. Touhou Bougetsushou - Kaguya's Profile
  5. 5.0 5.1 5.2 Cage in Lunatic Runagate - Chapter 2
  6. Cage in Lunatic Runagate - Chapter 1
  7. Cage in Lunatic Runagate - Chapter 4
  8. Foul Detective Satori - Chapter 16. Mokou confirms that she knew Kaguya would sneak out to the village, and that she would show Kaguya around.
  9. https://www.shrinemaiden.org/forum/index.php?topic=18442.0