Princess

Biodata

Feature	Details
Name	Houraisan Kaguya (Princess; original: 公主) 270 890
Alias(es)	Her Highness the Princess; World's Number One Princess; NEET Princess; Little Night; Hōrai Furniture Shop 5 644 950 1006
Species/Race	Moon Princess; a clone of Tsukuyomi, the Moon Goddess 1001 1144
Gender	Female
Affiliation	Eientei; later resides with Mo Yi's household 270 1143
Occupation/Role	Master and nominal landlord of Eientei; game designer; collector of treasures 270 273 950
Status	Active; married to Mo Yi 678
First Appearance	Chapter 5, as “World's Number One Princess” 5

Background / History

Kaguya lives at Eientei, where Reisen serves as her pet and attendant and Yagokoro Eirin acts as her long-time caretaker. Though often dismissed as an unreliable shut-in, she is Eientei's master and deliberately emphasizes her standing when she returns to her territory. 197 270

She first builds a relationship with Mo Yi through online games and video calls. When he goes missing for a period, she becomes too worried to play, eat, or sleep properly, then attempts to research interdimensional travel so that she can find him herself. Her unsuccessful research nevertheless produces other advanced technology. 5 459

Kaguya organizes the First Duel King Tournament of Gensokyo partly to assist Mo Yi, but also to publicly establish her claim over him before potential rivals. During the tournament, she agrees to confront the Scarlet Devil Mansion in an infinite Spell Card match and decisively removes Patchouli from the stage with her time ability. 270 310 322

Her relationship with Mo Yi develops through games, rivalries, and a set of five “difficult problems” tied to her five secret treasures. She offers marriage and one treasure if he completes the challenges, though she privately intends to make the outcome favor her. They later consummate their marriage. 405 406 612 678

During the Moon Princess Guardian Battle, Tsukuyomi captures Kaguya, overpowers her time ability, and takes her memories of Mo Yi. Kaguya later learns that she is Tsukuyomi's clone, a revelation that leaves her feeling inferior and uncertain whether she deserves to remain beside Mo Yi. Mo Yi rejects the idea of her merging with Tsukuyomi and affirms that Kaguya herself is irreplaceable. 863 895 1001 1006

After returning from the Moon Capital, she refuses Tsukuyomi's offer of the Moon Capital throne. She later joins Mo Yi and Alice in his home, where she begins adapting to his larger household while continuing to compete for his attention. 1007 1143 1157

Appearance

Kaguya is an otherworldly beautiful young woman with a youthful appearance around that of a sixteen- or seventeen-year-old. As a Moon Princess and clone of the Moon Goddess, she possesses an innate beauty-related aura that makes observers perceive her as an embodiment of beauty. 23 1144

• Raven-black, exceptionally long straight hair, described as nearly knee-length when worn loose 409 898
• Dark eyes and a youthful, loli-like face 917 1144
• Usually wears lavish Twelve-layered robes; their extensive coverage is jokingly compared to armor capable of blocking arrows 253 894
• Also wears modern outfits, including a JK uniform and sportswear 409 892
• Has a vast magically expanded wardrobe containing clothing accumulated across her long life 894

Personality

Kaguya is proud, theatrical, and openly narcissistic about her appearance. She considers herself Gensokyo's most beautiful woman and initially regards Alice as a rival for that title. Her pride also makes her highly competitive, particularly whenever Mo Yi's attention is involved. 259 304

A dedicated gamer and self-described NEET Princess, she approaches romance with the same mindset she brings to games: creating routes, setting conditions, planning events, and trying to force favorable outcomes. She can be manipulative and possessive, but her schemes often expose how badly she wants Mo Yi to choose her. 273 277 612

Beneath her bravado, Kaguya is caring and easily unsettled by threats to her peaceful life or separation from Mo Yi. She forces him to rest when he exhausts himself gaming, worries about his safety when Tsukuyomi appears, and volunteers herself as a disposable vanguard because she can revive. 277 620 895

Abilities & Skills

Eternity and Moment

Kaguya's defining ability manipulates time. It does not literally halt time, but its effects are nearly indistinguishable from time stop; unlike Sakuya Izayoi's time stop, Kaguya can directly alter the state of objects while it is active. 306

• Can accelerate herself, relocate targets, and make abrupt changes that opponents may not perceive 300 322 863
• Removed Patchouli from the tournament stage and broke her magical shields without injuring her or leaving detectable traces 322
• Creates time barriers in which prolonged rest or gaming takes only an instant in the outside world 277 894
• Can use the ability to maintain Eientei and her possessions without aging or deteriorating 894
• Her power depends on activating it in time; without it, her reaction speed and combat experience are poor compared with fast close-range fighters 1155
• Tsukuyomi can override or ignore the ability, making Kaguya unable to escape through time manipulation alone 863 895

Immortality

Kaguya can revive at full health and power after death, allowing her to take risks that ordinary fighters cannot. 459

• Volunteers to scout dangerous situations by charging in first, expecting to revive if killed 620
• Her immortality does not prevent defeat, capture, unconsciousness, or being physically incapacitated 501 891 906

Charm Aura

As a Moon Princess, Kaguya unconsciously radiates a mystical charm aura tied to her beauty. Mo Yi's rune-enhanced resistance lets him withstand its mental influence. 23 1144

• Enhances the impression of her beauty beyond ordinary physical appearance 1144
• Has a mental effect on those without sufficient resistance to mystical influence 23

Five Secret Treasures

Kaguya possesses five original secret treasures, conceptual armaments that represent the very concepts of their respective treasures rather than ordinary physical replicas. 406

• The Hōrai Jade Branch is specifically identified as the conceptual existence of all Hōrai Jade Branches 406
• She also identifies the Buddha's Stone Bowl and Dragon Neck Jewel among the treasures, though their individual functions are not disclosed 406
• The treasures can be summoned to orbit around her and enhance her combat ability 406 863
• Kaguya considers them her most prized possessions, yet cannot remember where they originally came from 406

Game Design and Technology

Kaguya is an accomplished game creator and inventor, using technology and psychological observation to create unusually immersive experiences. 273 277

• Created New Tale of the Bamboo Cutter, a dating simulation whose protagonist was modeled from her study of Mo Yi 273 277
• Designed distinct routes in which the game's version of Kaguya changes subtly according to the player's choices 277
• Developed the “Gaia Foundation,” a device capable of completely altering a person's appearance 280
• Owns a high-investment gaming account with nearly every character at SSS rank and their optimal equipment 1146

Equipment / Weapons / Items

• Five Secret Treasures — Five original conceptual armaments, including the Hōrai Jade Branch 406 863
• Gaia Foundation — Appearance-altering makeup device developed by Kaguya 280
• Personal notebook — Contains her private thoughts and plans concerning Mo Yi; Tsukuyomi takes it during Kaguya's capture 863
• Magical wardrobe — A spatially expanded wardrobe spanning several rooms and holding tons of accumulated clothing, organized by Reisen 894

Relationships

• Mo Yi — Online gaming partner, romantic interest, and eventual husband. Kaguya is jealous of his closeness with other women, designs games and trials to draw him closer, and relies on him during the Moon Capital crisis. 262 405 678 1006
• Yagokoro Eirin — Long-time friend, subordinate, and protective caretaker at Eientei. Eirin worries about Kaguya's relationship with Mo Yi and entrusts Kaguya's rescue to him. 272 908
• Reisen — Kaguya's pet and attendant, frequently assigned errands, intelligence work, and tournament invitations. 197 270
• Tsukuyomi — Kaguya's creator and parent. Their relationship is hostile and deeply strained: Tsukuyomi captures Kaguya, takes her memories, and later offers her the Moon Capital throne. 863 1001 1007
• Alice Margatroid — Initially Kaguya's beauty rival and an object of hostility, especially because of Alice's closeness to Mo Yi. Their relationship later improves enough for them to cooperate against Tsukuyomi. 259 1141
• Madam Kishin — A dangerous and complicated associate who has captured Kaguya and sealed her abilities; Mo Yi later stops Kishin from joining an attack on the injured Princess. 501 891
• Patchouli Knowledge — Opponent defeated almost instantly in the Duel King Tournament; Patchouli resolves not to become Kaguya's enemy until she understands her ability. 322
• Remilia Scarlet — Rival whose conflict with Kaguya leads to the Spell Card Battle against the Scarlet Devil Mansion. 308 310

Story Role / Major Arcs

Eientei and the Duel King Tournament

Kaguya brings Mo Yi to Eientei, stages her authority as its master, and hosts the Duel King Tournament as both a public event and a declaration of romantic “sovereignty.” She later defeats Patchouli through precise time manipulation. 270 322

Five Difficult Problems

After probing Mo Yi's feelings, Kaguya presents five challenges modeled after her legendary treasures. She promises marriage and one treasure as the reward, privately intending to guide the romance scenario to her advantage. 405 406 612

Moon Princess Guardian Battle

Facing the threat of the Moon Capital, Kaguya leaves Eientei with Eirin and is later confronted by Tsukuyomi. Her attempted escape and attack fail, leading to her capture, loss of memories, and discovery that she is Tsukuyomi's clone. 814 863 1001

Return to Mo Yi's Household

Kaguya rejects the Moon Capital throne and returns to Mo Yi's side. She meets his Valkyrie household, demonstrates her high-level game account, and continues competing for her place in his life. 1007 1143 1146 1157

Notable Quotes

“Eientei is this Princess's territory!” 280

“My five secret treasures are originals, conceptual existences.” 406

“Then this Princess will marry you unconditionally.” 406

Trivia

• Kaguya's “Hōrai Furniture Shop” title comes from both her furniture business and her habit of collecting and showing off treasures through the Moon Capital Grand Exhibition. 950
• She rejects being confused with Hatsune Miku despite using the screen name “World's Number One Princess.” 5
• Her preferred battle music is “Bamboo Cutter's Flight.” 300
• Although she is immortal, Kaguya is notoriously willing to exaggerate injuries so that Mo Yi will carry her. 891 892