The Shut-In Princess of Eientei

Biodata

Background / History

Kaguya resides in Eientei in Gensokyo, where she spends much of her time beneath a kotatsu with a handheld game console. She is described as a veteran internet addict and possesses media and other resources that drifted in from the outside world. 33 34

She joins the Myriad Worlds Chat Group alongside Homura Akemi. Immediately recognizing Lin Xiao's Ultraman Gaia avatar, Kaguya realizes that the group connects worlds she knows through games, manga, anime, and other media. She openly tells the members that their lives are fictional works from her perspective, while also acknowledging that Gensokyo could be fictional from someone else's perspective. 33 34

Her knowledge makes her a valuable—if disruptive—source of future information. She identifies figures such as Starlight, Aizen Sōsuke, Daigo Madoka, Lelouch, and the members of the Seven before they reveal their identities themselves. 57 77 102 118

Her later identifications include Ai Haibara, Saitama, Jun Himeya, Ainz Ooal Gown, Tendou Souji, and Tony Stark. She continues supplying both warnings about their original stories and suggestions designed to turn their altered circumstances into entertainment for the group. 101 127 228 238 284 286 325

Appearance

Kaguya is repeatedly described as exceptionally beautiful, with a stunning face and beautiful eyes. 33 60

• Often depicted in Eientei wrapped in a kotatsu blanket while gaming. 33
• Carries herself with exaggerated aristocratic flair when praised for her beauty, including producing a folding fan to cover part of her face. 60
• Her beauty is considered dangerous enough that Batman worries public idolization of her could cause large-scale social disorder. 139
• Crushes her fan in anger when Zesshi Zetsumei declares her intention to become Lin Xiao's partner. 254
• Described as a breathtaking black-haired girl when Ainz recalls her clinging to Lin Xiao's arm in Nazarick. 245

Personality

Kaguya is an unrestrained shut-in, avid gamer, and spectator who enjoys drama more than decorum. She habitually treats serious cross-world crises as entertaining scenes to watch, providing running commentary, teasing participants, and eagerly requesting tickets to major battles. 48 54 59 134

She is shamelessly opportunistic and quick to switch from arrogance to surrender when confronted by overwhelming power. After seeing Lin Xiao's Shining Form, she immediately apologized for her prior behavior and began calling him her “real dad.” 43

Despite her tendency to stir up chaos, Kaguya has strong disgust for cruelty and exploitation. She harshly condemns Vought and the Seven after recognizing their true nature, rejects slave-trading villains, and consistently supports Lin Xiao's side regardless of conventional distinctions between heroes and villains. 57 77 189

Her appetite for spectacle can clash with other members' desire for peace: she complains that Nazarick's peaceful transformation lacks bloodshed, but eagerly embraces the prestige of being mistaken for Lin Xiao's partner. Ainz later wins her support by promising a gold statue and a place of honor in Nazarick. 245 265

Her attachment to fictional characters can also produce sincere concern. After recognizing Jun Himeya, she recounts his persecution and repeated injuries in the original story and emphatically demands that Lin Xiao prevent him from enduring the same lonely suffering again. 228

Kaguya particularly enjoys provoking romantic jealousy around Lin Xiao. She frames his relationships as a dramatic competition, adopts an exaggeratedly sweet manner to contrast herself with other women, and complains when his allies resolve social encounters without conflict. During the cruise, her desire for a “romantic bloodbath” leads her to expose the private command team's records to the main group. 182 307 313

When her provocations invite retaliation, she readily seeks help and bargains for leniency. After the cruise-chat leak, she tearfully asks Eirin for advice under the pretense of helping a friend; during a later mute, she floods Lin Xiao's private messages with apologies and entertainment offers. 316 338

Abilities & Skills

Hourai Immortality

Kaguya drank the Hourai Elixir, granting her an immortal body that never ages or dies. 48

• Claims that consuming her flesh could grant eternal youth and immortality. 48
• Her attempt to upload her flesh to the Chat Group store was rejected as a “bloody illegal transaction.” 48
• Her immortality makes Lin Xiao consider her safe enough to accompany dangerous cross-world outings. 172

Manipulation of Eternity and the Instant

Kaguya can manipulate eternity and the instant to distort the time separating herself from an approaching opponent. When Zesshi Zetsumei tries to reach Lin Xiao, Kaguya stretches the intervening time infinitely: Zesshi appears close but cannot advance, regardless of her speed or strength. 256 257

• Calls her defense “Limitless” for dramatic effect, then admits that she borrowed the name from Jujutsu Kaisen. The display surprises chat-group members who had regarded her chiefly as comic relief. 256
• Continues holding Zesshi at bay while casually eating potato chips, calling the effect an “extra-dimensional treadmill.” 257

Outside-World Media Knowledge

Kaguya has extensive knowledge of other worlds through games, manga, anime, and doujinshi that reached Gensokyo. 34 35

• Identifies characters, hidden identities, organizations, and future events before many group members learn them themselves. 57 77 102 118
• Uses her knowledge to warn Starlight about Vought and the Seven's corruption. 57
• Provides tactical and genre-based commentary on Ultraman battles, including Five King's expected threat and Gaia Supreme's undefeated record. 103 214
• Her knowledge is incomplete when the original source material remains unfinished; she cannot provide Imu's unrevealed abilities. 193
• Recognizes Tomie Kawakami and warns the group about her seduction and regeneration, prompting debate over whether ordinary destruction could contain her. 222
• Identifies a Space Beast from Ultraman Nexus and explains its fear-based feeding and capacity for continuing evolution. She subsequently recognizes Jun Himeya and describes the persecution and injuries he suffers in his original story. 227 228
• Recognizes Ainz as the protagonist of Overlord and warns the group about his future massacre and Nazarick's hostile attitude toward humanity. 238
• Explains the stories behind performers at the student music festival, including K-On! and Hotarubi no Mori e. She notices that Gin remains present after human contact, contrary to the latter story's rule, and suspects Lin Xiao's power is preserving his soul. 277 278
• Recalls the setting and circumstances of Tendou Souji's original Kabuto debut, including Hiyori's danger at an abandoned Shibuya warehouse and Kagami's confrontation with the Spider Worm. 286
• Recognizes Tony Stark and identifies his cave imprisonment, chest electromagnet, salvaged missile components, and planned Mark I armor. She warns that his captors will attack early and that Dr. Ethan will die buying him time to escape. 325
• Her references are not infallible: during the discussion of Jin Kagami's humanity, she mistakes Lin Xiao's reference to Yang Jian from The Mysterious Revival for Erlang Shen. 297

Chat-Group Functions

Kaguya uses the chat group's image sharing, file uploads, private messaging, and private-chat features for both information sharing and provocation. 182 313 333 338

• Uses the private chat's Sync plugin to share the Cruise Ship Tactical Command Room's records with the main Myriad Worlds Chat Group. This is a chat-system function rather than a demonstration of her temporal ability. 313
• Uploads the large group file The Complete Iron Man Chronicle: From the Cave in Afghanistan to Endgame. 333
• Can still contact Lin Xiao privately while muted in the main group, although he can independently silence her private-message notifications. 338

Power Progression

Equipment / Items

• Handheld game console — Used while lounging under Eientei's kotatsu. 33
• Outside-world media archive — Includes games, manga, and a large collection of doujinshi stored on her computer or hard drive. 34 35
• Folding fan — Used to theatrically accentuate her self-proclaimed aristocratic beauty. 60
• The Complete Iron Man Chronicle: From the Cave in Afghanistan to Endgame — A large file she uploads to the chat group after attempting to provoke Tony Stark and Batman into fighting. 332 333

Relationships

• Lin Xiao — Her group owner and chosen allegiance. Kaguya declares that she will stand wherever he points and calls herself his most loyal “leg accessory”; he frequently mutes or threatens to mute her for disruptive behavior. She later encourages rumors that they are a couple and publicly claims him when Zesshi pursues him, though Lin Xiao denies the supposed relationship. 36 43 77 245 246 254 She subsequently leaks his private cruise-command records to the main group, then seeks Eirin's help to deal with the consequences. By Chapter 338, she is again pleading for an unmute, while Lin Xiao leaves her private messages unanswered and silences their notifications. 313 316 338
• Eirin Yagokoro — An Eientei associate who witnesses Kaguya's tantrums and considers her internet addiction beyond saving. 33 36 Eirin later encounters another outburst after Kaguya is muted over the Kara photograph. Following the cruise-chat leak, Kaguya clutches Eirin's coat and begs for advice on soothing angry girls, pretending that the problem belongs to a friend. 182 316
• Yukino Yukinoshita — A frequent target of Kaguya's teasing over outside-world fan works. Yukino strongly approves when Lin Xiao mutes Kaguya and later angrily reprimands her vulgar remarks. 35 36 143 Kaguya also tries to provoke her jealousy over Lin Xiao's encounters with other women; Yukino is among those who receive the leaked cruise-command records. 132 133 182 313
• Batman — A fellow group member who is wary of her provocations and believes her beauty and thrill-seeking personality could become a societal threat if left unchecked. Kaguya later praises his administrative takeover of the Slane Theocracy while teasing him about its cost. 34 139 256 She attempts to escalate his technological rivalry with Tony Stark into a fight, proposing a humiliating costume penalty for the loser. 332
• Daigo Madoka — Kaguya enthusiastically recognizes him as Ultraman Tiga and repeatedly comments on his battles and expected future as part of the “Heisei Three Thugs.” 102 103 124
• Ainz Ooal Gown — Mistakes Kaguya for Lin Xiao's partner and calls her “big sister-in-law.” She adopts the title, offers him her protection, and later advocates for him after he promises to honor her with a gold statue and elevated status in Nazarick. 245 265
• Zesshi Zetsumei — Kaguya treats Zesshi's pursuit of Lin Xiao as an attempt to steal her partner. She confronts Zesshi and uses temporal manipulation to stop her from reaching him. 254 256 257
• Jun Himeya — A tokusatsu hero whom Kaguya deeply admires for continuing to protect humanity despite persecution and severe injuries. She insists that Lin Xiao protect him from repeating his original tragic experiences. 228
• Fujiwara no Mokou — Kaguya names her as the intended target when requesting a Kabuto Rider System, hoping to use Hyper Clock Up to defeat her in Gensokyo. No acquisition of the system is established by this request. 237
• Tendou Souji — Kaguya enthusiastically recognizes him upon his arrival, then provokes him by suggesting that Lin Xiao steal his iconic Kabuto debut and take Hiyori back to Chiba. Tendou responds with a threat, while Lin Xiao protests her suggestion. 284 286
• Tony Stark — Kaguya recognizes his identity and captivity circumstances immediately, warning him about Dr. Ethan's impending death. She later mocks him during his rivalry with Batman and uploads an account of his story through Endgame. 325 332 333

Story Role / Major Arcs

Joining the Myriad Worlds Chat Group

Kaguya enters the group as the “Shut-In Princess of Eientei,” immediately recognizes Gaia, and reveals that she knows the other members as fictional characters. Her claims trigger confusion and existential discomfort among the group. 33 34

Doujinshi Incident

She offers explicit fan works involving Batman, Joker, Naruto, Sasuke, and Yukino, then continues teasing Yukino despite Lin Xiao's attempt to defuse the situation. Lin Xiao mutes her for twenty-four hours, leaving Eientei temporarily quieter. 34 36

Magical Girl Crisis Commentary

Kaguya comments on Homura's situation through her knowledge of Puella Magi Madoka Magica, dismissing conventional solutions and proposing that Madoka simply be hidden away until Witch's Night passes. 37

She later delights in Kyubey's attempt to recruit Aizen, imagining him transforming with a pink magical wand and a skirt, while regretting that Batman is not present for the encounter. 89

Ultraman and Tiga World Events

Kaguya serves as the group's most vocal tokusatsu commentator, reacting to Lin Xiao's Shining Form, identifying Daigo as Tiga, explaining the “Heisei Three Thugs” nickname, and celebrating the brutal defeat of Five King. 43 102 103 124

When a Space Beast appears in Lin Xiao's world, she identifies it as an enemy from Ultraman Nexus and explains its fear consumption and evolutionary potential. Jun Himeya's subsequent appearance prompts a more serious response: she praises his endurance in the original story and demands that Lin Xiao spare him a repeat of its suffering. 227 228

Cross-World Excursions

After repeatedly complaining that she is bored of gaming in Eientei, Kaguya receives points from Lin Xiao and later joins cross-world operations. She agrees to participate in the Monster Association raid after Lin Xiao promises a global livestream, and is later permitted to join the Gotham outing against Zod. 59 134 139 172

The points gift consists of an exclusive red packet containing 1,000 points, sent after she complains that she cannot afford a cross-world ticket because the store will not accept her flesh. 59

During the Gotham outing, she photographs Kara Zor-El looking at Lin Xiao and posts the image to provoke speculation about his love life. 182

She tags Yukino, Shinobu, and Homura to solicit reactions, openly expressing disappointment when Yukino refuses to display jealousy. Lin Xiao mutes her for twenty-four hours, prompting another pillow-clutching tantrum in Eientei. 182

One Piece World Vote

Kaguya votes emphatically to expel the “Descendant of the Creator” from the chat group, then celebrates when Ichigo's presence successfully stabilizes a cross-world passage to the One Piece world. 192

Nazarick and the Slane Theocracy

Before the intervention, Kaguya recognizes Ainz as the “Bone King” from Overlord and describes his original future as a ruler responsible for mass killing. She enthusiastically supports deploying to his world, although Lin Xiao rebukes her calls for purging hostile races as sounding like a world-destroying villain. She joins Lin Xiao, Batman, and Naruto for the teleportation to Nazarick's Tenth Floor Throne Room. 238 239

In the Overlord world, Kaguya complains that Nazarick's peaceful direction is boring. Ainz, hoping to appease her, calls her Lin Xiao's “big sister-in-law.” She accepts the title and prolongs the misunderstanding despite Lin Xiao's objections. 245 246

When Zesshi Zetsumei declares that she wants to become Lin Xiao's partner and bear his children, Kaguya confronts her and claims Lin Xiao for herself. She subsequently prevents Zesshi from reaching him with Manipulation of Eternity and the Instant, revealing the power behind her unserious public persona. 254 256 257

Kaguya later overhears Ainz's fear that his former guildmates will discover his changes to Albedo's settings and threatens to record their eventual confrontation. Ainz promises to honor her in Nazarick, prompting her to switch from mocking him to urging Lin Xiao to help. 264 265

Student Music Festival

Kaguya briefs the chat group on the stories of the festival's performers, initially framing their competing performances as an entertaining clash of dramatic plots. Her account of Gin and Hotaru's inability to touch one another leaves the group shaken. Noticing that Gin has survived contact with a human despite becoming translucent, she suggests that Lin Xiao's power may be holding his soul together. 277 278

Tendou Souji and the Kabuto World

Kaguya reacts with intense excitement when Tendou joins the group, noting that his arrival follows their discussion of Kabuto. After Tendou receives information about Hiyori and the Natives' plans, Kaguya proposes that Lin Xiao cross worlds with his knockoff Kabuto belt, transform before Tendou at the abandoned Shibuya warehouse, and steal his iconic debut. Her additional suggestion that he take Hiyori back to Chiba draws objections from both men. 284 286

During the later discussion of whether Jin Kagami should be regarded as human or monster, she misunderstands Lin Xiao's Yang Jian comparison. Their ensuing argument contributes to Lin Xiao muting the group chat. 297

While watching Lin Xiao's armor fail against a mass of enemies, Kaguya reassures the group that the armor is not what protects him. She interprets its destruction as the removal of a god's limiter, anticipating the release of his true power rather than his defeat. 302

Cruise Ship Tactical Command Room

As Lin Xiao anticipates a cruise involving numerous women, Kaguya offers background music and self-defense gear while demanding a livestream. She asks to attend in person so she can eat popcorn and watch his romantic difficulties, prompting him to threaten to throw her into Tokyo Bay if she appears. 311

Lin Xiao, Batman, Aizen, and Lelouch establish the private Cruise Ship Tactical Command Room to guide him through the event. Kaguya discovers it almost immediately and, after her initial request is rejected, privately begs Lin Xiao to admit her, promising useful analysis of female psychology. By the cruise, she has gained access to the private voice chat. 312 313

Dissatisfied with the team's safe advice and Lin Xiao's success at appeasing the guests, Kaguya activates the Sync plugin and shares the private records with the main group. Yukino receives the records while watching Lin Xiao from the ship's second-level terrace. 313

Afterward, Kaguya tearfully turns to Eirin for advice, describing the predicament as a friend's accidental provocation of a violent god. Eirin subsequently witnesses her saluting empty air beneath the kotatsu, shouting “Loyalty,” and muttering about “onii-chan” and the position of “main wife.” 316

Tony Stark's Arrival and Armor Rivalry

Kaguya identifies the newcomer “New York's Richest and Smartest” as Tony Stark. When he dismisses the chat as a prank by his captors, she describes his cave, electromagnet, missile scrap, and planned Mark I suit, then warns that Dr. Ethan will be killed helping him escape. Her detailed knowledge forces Tony to take the warning seriously. 325

When Tony and Batman exchange threats over their armor projects, Kaguya encourages them to fight and proposes that the loser wear a cat-eared maid outfit and dance for the group. Her taunts help redirect Tony's fear into anger and renewed motivation to improve his technology. 332

After the proposed fight fails to materialize, she uploads The Complete Iron Man Chronicle: From the Cave in Afghanistan to Endgame to the group. 333

Later Main-Group Mute

By Chapter 338, Kaguya is muted in the main group and bombards Lin Xiao's private chat with demands and apologies. She promises not to post explicit comics of him and Batman again and offers a video of a wild rabbit caught at Eientei doing the hula. Lin Xiao declines to engage, leaving her messages read and muting the private conversation's notifications. 338

Notable Quotes

“We're all two-dimensional characters, so life still has to go on! Don't worry about those vague and intangible things. Being happy is what matters most!” 34

“Do I even need to choose?! Of course I'll stand unwaveringly and without hesitation on Lord Lin Xiao's side!!!” 77

“With a god-tier lineup like this! Forget some King of the World Imu! Even if that original author who hasn't finished updating personally jumped out of the manga, we could pin him to the ground, beat him up, and force him to release more chapters, okay?!!!” 193

“You want to get past me and bother Big Brother Lin Xiao? Run through this 'extra-dimensional treadmill' first.” 257

“Unlike them, I only care about you, big brother~” 307

“You're picking nothing but safe options! There isn't a whiff of conflict! I want a romantic bloodbath! I want rivers of blood!!” 313

Trivia

• Kaguya attempted to sell her own immortal flesh through the Chat Group store to obtain points, but the system rejected the listing. 48
• She wants to become an idol through the Hero Association, though Batman considers the potential fanatical reaction to her beauty a global-level risk. 139
• She is repeatedly muted or threatened with muting because of her vulgar jokes, spoilers, and relentless teasing. 36 101 143
• Her preferred response to difficult situations is often rapid surrender, which other members describe as flexible and shameless survival philosophy. 104
• She borrows the name “Limitless” from Jujutsu Kaisen for her temporal defense rather than presenting it as the original name of her ability. 256
• Kaguya Houraisan is distinct from Kaguya Shinomiya, the Shinomiya Group heiress who also pursues Lin Xiao. 33 151 220
• She briefly volunteers herself as a candidate for Japan's prime minister on the grounds that she is a princess of the Lunar Capital; Lin Xiao immediately rejects the suggestion. 127
• She requests a Kabuto Rider System specifically to use Hyper Clock Up against Fujiwara no Mokou, but the request does not establish that she receives one. 237
• Her later apologies reveal that her provocative fan-work sharing extends to explicit comics pairing Lin Xiao with Batman. 338