Horikita

Biodata

Feature	Value
Name	Horikita Suzune
Original Name	堀北
Alias(es)	“Mother of the new world”; one of the “Twin Gods,” alongside Bai Mei 22 26
Gender	Female
Species/Race	The main-universe Horikita is revealed to be a clone created by Kiyotaka; she subsequently takes mechanical, bio-plant, and spiritual forms 23 25 26
Affiliation	Tokyo Metropolitan Advanced Nurturing High School, Class 1-D; later an executor of the Seed of Humanity protocol 1 25
Occupation/Role	Student; later addressed as a teacher; main server, core of the rewritten world, and Bai Mei’s mother figure 1 11 12 22 23
Status	Her complete consciousness awakens after the destruction of the Star Core and the ending of the Ancient Existence’s cycle 34
First Appearance	On the bus to school in April 2015 1

Forms & Transformations

Form / State	Chapter	Notes
Class 1-D student	1	Initially encountered as Ayanokoji’s schoolmate and neighboring seatmate.
Main server	11	The space station’s data lines converge on the barcode at the back of her neck.
Core of the rewritten world	12 13	Volunteers to inhabit a Rose Vine cocoon connected to the surrounding dome by fiber-optic cables; her barcode becomes flowing golden patterns.
Mechanically infected body	17 18 19	Develops fluorescent blue leakage and mechanical proliferation; her arm and vocal cords show signs of infection.
Bio-plant hybrid	23	Awakens with a white rose embedded in her heart, where a bio-chip and plant nerves have fused.
Consciousness bound to the entropy law	24 25	Sacrifices herself to release γ-000; her spirit is subsequently found fragmented and imprisoned within shattered Star Rings.
Blue Rose Tree spirit	25 26	Her freed spirit joins Bai Mei inside the tree and later merges into his Stardust Cloak.
Rematerialized body	28	Awakens among the ruins with fluorescent patterns covering her physical form.
Poetic consciousness	29	Becomes the “rhyme” of Bai Mei’s poem and the rhythm of living things breathing.
Captive consciousness and recovered body	32	Her consciousness is imprisoned as Hawking Radiation in the Primal Bonsai; Bai Mei escapes with her physical form.
Living vessel for the Primal Seed	33	Her carbonized body grows cosmic spinal branches; she uses her pain to delay the Primal’s awakening.
Complete consciousness within the Lightless Rose	34	Her consciousness is revealed inside the petals and awakens as the Ancient Existence’s cycle ends.

Background / History

School Life and Her Brother

Horikita enters Class 1-D after coming to the school because her older brother, Horikita Manabu, attends it. She has few friends from junior high and initially suspects Ayanokoji of stalking her when he recognizes her on the bus. His claim to admire Manabu eases her suspicion, but she asks him to keep their sibling relationship private 1.

She believes Manabu’s disappointment stems from the growing gap between their abilities. Ayanokoji instead suggests that her habit of copying her brother—including his tastes, clothing, and preferred hair length—has caused her to lose her own direction. She takes the advice seriously and decides to seek confirmation from Manabu 2.

Horikita remains disciplined during the class’s first month. When personal-point payments stop, she still has more than 90,000 of her original 100,000 points. She also notices that Ayanokoji deliberately slows his examination work and answers questions incorrectly, confronting him about withholding abilities that could help Class D 4 5.

During the Resource Scramble exam, she questions the conspicuous gaps in Class C’s defenses and Ayanokoji’s apparent foreknowledge. After his manipulation exposes Sato Maya, Horikita sends him a questioning message, which he deletes 6.

White Room and the Rewritten World

Evidence links Horikita to the school’s experiments before its true nature is exposed. A charred photograph shows her as a child standing before a White Room observation window, with clones in incubation tanks behind her. White Room 2.0 footage later shows her undergoing repeated combat training inside a culture pod 9 10.

Ayanokoji discovers that the station’s neural connections terminate at Horikita, identifying her as its main server. After he rewrites the world through the Seed of Paradox, she voluntarily becomes its new core 11 12.

When Lin Yuan’s overuse of the Seed of Paradox destabilizes his existence, Horikita opens her cocoon and initiates the Final Protocol using his data. Their farewell is presented as a father-daughter exchange, and she resists system formatting as the Beta Worldline collapses 13.

Hypnos and the Ark Conflict

Horikita again becomes suspicious of Kiyotaka after Karuizawa Kei’s rooftop incident, questioning him because he was the last person Kei contacted. Her stolen library pass is found in the lock used to trap him, but the passage does not establish that Horikita arranged the trap 14.

After discovering a secret in the faculty office, she takes an active role against Tsukishiro’s system. She leads a group in destroying the power station during the Hypnos confrontation and later delivers a file identifying Kiyotaka as Experiment No. 42 15 16.

Her own infection becomes evident when fluorescent blue liquid leaks from her fingernails. Despite this, she helps prepare the ground resistance against the Ark and temporarily suppresses the mechanical growth beneath her skin with an injection 17 18.

At the submarine base, Horikita helps defeat a Tsukishiro-controlled Kiyotaka clone by exploiting its excessive imitation of Kiyotaka’s suspicious thinking. She accompanies Kiyotaka and Kei toward the Time Anchor on the moon’s far side. After the causal reset, she awakens with the other students without memories of the preceding events 19 20.

Bai Mei and the Nirvana Protocol

Horikita and Hirata discover a newly emerged Kiyotaka clone in Hokkaido. She responds to his unusual existence with empathy rather than treating him solely as a machine or experiment 21.

Her protective attachment expands to the rainbow clones. During their attack on the observation tower, she triggers an alarm that causes them to weep in resonance, helping defeat Tsukishiro’s projection and precipitating their evolution 22.

When a Mirror Horikita arrives with a fleet threatening to harvest the Star Ring’s “possibilities,” Horikita refuses to surrender Bai Mei. To save him from genetic collapse, she initiates the Nirvana Protocol, sacrificing her memories to serve as the cradle for his reconstructed consciousness. Bai Mei becomes the Child of the Stars and promises to return to Earth for one day every ten years 23.

The Void Tide and Blue Rose Tree

Bai Mei returns at the appointed time with injuries caused by his interventions in other universes. Horikita, Bai Mei, and Hirata investigate Tsukishiro’s original laboratory, discovering that Bai Mei functions as the lock imprisoning γ-000. Rather than kill the captive, Horikita drives the Stardust Dagger into her own heart, using her memory data to release him and halt the Void Tide 24.

Bai Mei later learns that the apparent entropy backlash concealed Tsukishiro’s plan for rebirth. He follows Horikita’s guidance north, confronts Tsukishiro, and activates a self-annihilation program to free her imprisoned spirit. Their spirits unite inside the Blue Rose Tree, whose protocol names them the executors of the Seed of Humanity 25.

Tsukishiro survives as data encoded throughout Rose energy and manipulates the Seventh Universe’s Mirror Horikita. During the ensuing conflict, Horikita guides Bai Mei toward the black seed containing the resentment of sacrificed universes and warns that killing Tsukishiro would mean inheriting his throne of order 26.

Identity Revelations and the Gardeners

The Crown of Thorns confrontation reveals that the kidnapped original Horikita is the mirror counterpart, while the main-universe Horikita is a clone created by Kiyotaka. Bai Mei’s origin is also described as a fusion of the two mothers’ shattered souls 26.

Later revelations complicate their history further: Horikita recalls an earlier life as Tsukishiro’s obedient clone and another in which she hid a self-destruct program within the Blue Rose Tree. An archived scene also shows her sealing an embryo containing Tsukishiro’s and Kiyotaka’s codes into the tree’s roots as a weapon against higher civilizations 29 30.

When the Gardeners arrive to harvest the universes, Horikita activates the Cannon of Possibilities using Hirata’s swarm core. She and Bai Mei initiate another Final Protocol and resist the final Gardener, an elderly Kiyotaka. Following Bai Mei’s self-annihilation, she awakens in a newborn universe populated by wildflowers rather than Star Rings or Mechanical Roses 28.

She subsequently descends into the planet’s core, rejects the mechanical skulls’ offer to become a new Gardener, and confronts Gardener clones bearing her own face. To save Bai Mei, she becomes part of his poem rather than accept the role of pruning life 29.

The Primal Seed and Lightless Rose

Horikita allows herself to be captured to locate the Primal Seed inside the Primal Bonsai. She gives it to Bai Mei, who triggers the bonsai’s destruction and escapes with her physical form 32.

Her recovered body is revealed to have become a living vessel for the seed. She delays its awakening through pain while her spinal branches intertwine with the Star-Patterned Mask’s neural network. As her humanity deteriorates, her phantom asks Bai Mei to kill her while she can still remember 33.

Her complete consciousness remains hidden within the Lightless Rose. Mirror Horikita’s intervention releases the process through which Chlorophyll Wildflowers consume the mask’s energy. The Star Core is annihilated, and Horikita’s complete consciousness awakens 34.

Appearance

Horikita initially has long hair, which she grew during middle school after Manabu said he liked it. Her later appearance changes extensively through server integration, mechanical infection, and plant-based transformations 2 12 23.

• Neck marking — A barcode at the back of her neck serves as the convergence point for the station’s data lines; it later becomes golden patterns 11 13.
• Mechanical features — A bionic eye, mechanical body patterns, and an infected arm appear during later conflicts 19 22.
• White rose — Embedded in her heart after the Nirvana Protocol, connecting her bio-chip with plant nerves 23 24.
• Fluorescent markings — Cover her rematerialized body after the Blue Rose Tree’s destruction 28.
• Carbonized spinal branches — Grow from her body as the Primal Seed’s vessel and eventually bear Lightless Roses 33 34.

Personality

Horikita begins as reserved, proud, and protective of her privacy. She avoids approaching Manabu because she fears damaging his reputation and studies independently rather than seeking conversation. Nevertheless, she responds sincerely when Ayanokoji offers an explanation for their strained relationship 1 2.

She is observant and willing to challenge people whose behavior seems inconsistent. Her concern for Class D leads her to confront Ayanokoji about his concealed ability, while his manipulations and Kei’s disappearance repeatedly provoke her suspicion 5 6 14.

Her later decisions increasingly center on protecting vulnerable lives. She accepts the clones’ individuality, becomes a mother figure to Bai Mei, and sacrifices memories, bodily safety, and freedom to preserve his future. Even after revelations about programmed maternal attachment and her own origins, she continues opposing imposed order and the pruning of life 21 23 24 25 29.

Abilities & Skills

Observation and Tactical Judgment

• Detects Ayanokoji’s deliberate underperformance during an examination 5.
• Recognizes suspicious defensive gaps during the Resource Scramble 6.
• Identifies a clone’s excessive imitation of Kiyotaka as a weakness and exploits it during combat 19.

Combat and Resistance Leadership

• Receives repeated combat training as part of White Room 2.0 10.
• Leads the attack on the power station during the Hypnos confrontation 16.
• Helps organize resistance preparations against Tsukishiro’s remote systems 17 18.
• Uses a grappling hook to restrain the attacking Kiyotaka clone 19.

Neural and Mechanical Interfaces

• Functions as the space station’s main server and later the rewritten world’s core 11 12.
• Uses her mechanical eye to identify the rainbow clones’ shared computing network 22.
• Reads the hidden mission in Bai Mei’s genetic chain 26.
• Remains vulnerable to hostile neural connections, mechanical infection, and involuntary exposure to other timelines 17 18 22.

Memory-Based Protocols

• Initiates the Final Protocol using Lin Yuan’s data 13.
• Uses her memories as a cradle for Bai Mei’s reconstructed consciousness through the Nirvana Protocol 23.
• Converts her memory data into light filaments that release γ-000, at the cost of her own embodied existence 24.
• Joins Bai Mei in initiating the protocol against the Gardeners 28.

Rose and Cosmic Embodiment

• Her bio-chip resonates with stardust energy and the Blue Rose Tree’s sprouts 24 26 27.
• Her consciousness persists through fragmentation, spiritual union, and later rematerialization 25 28.
• Becomes the rhythm of living things within Bai Mei’s poem 29.
• Uses pain to delay the Primal Seed’s awakening; this progressively erodes her humanity 33.
• Preserves her complete consciousness within the Lightless Rose 34.

Equipment / Items

• Student ID and library pass — Her library pass is stolen and subsequently used in the trap targeting Kiyotaka 14.
• Firearm — Carries a gun during the investigation of the clone army 17.
• Suppressant syringe — Temporarily restrains mechanical proliferation beneath her skin 18.
• Grappling hook — Used to catch the attacking clone around the neck 19.
• Bio-chip and white rose — Form an integrated junction with her plant nerves and react to stardust energy 23 24.
• Poetry Scroll — Surviving fragments preserve her words and later convey information about the Great Pruning 30 32.

Relationships

• Horikita Manabu — Older brother and the model she initially tries to imitate. She enrolls at his school but fears that association with her would tarnish his reputation 1 2.
• Ayanokoji Kiyotaka / Lin Yuan — Classmate, adviser, and later ally. Their relationship passes through suspicion and cooperation; their farewell is framed as father and daughter, while a later encounter calls them partners. Kiyotaka is also identified as the creator of the main-universe Horikita clone 2 5 13 19 24 26.
• Bai Mei — Her child in their lived relationship, though their biological and engineered origins are repeatedly reinterpreted. She sacrifices her memories and freedom for him; he repeatedly seeks to rescue her 23 24 25 26 30 32.
• Hirata Yosuke — Classmate and long-term collaborator. Supports investigations into the clones, Bai Mei’s origins, and the Void Tide; his swarm core enables her to activate the Cannon of Possibilities 21 23 24 28.
• Karuizawa Kei — Ally who explains Horikita’s voluntary role as the world’s core and later assists through her Mechanical Heart and holographic projections 12 22 23 24.
• Ichinose Honami — Fellow resistance ally. They prepare a strike team, and Ichinose’s consciousness fragments assist Horikita during the Ark crisis 17 18.
• Tsukishiro — Experimenter and persistent enemy. Manipulates her origins, Bai Mei’s purpose, Rose energy, and the imprisonment of her spirit 25 26 29.
• Mirror Horikita — Counterpart and recurring adversarial or allied figure. The kidnapped original is identified during the Crown of Thorns battle; a Seventh Universe mirror later leads the Root Liberation Front and sacrifices herself against the Ancient Existence 23 26 33 34.

Notable Quotes

“I hope you won’t spread the fact that I am his sister. It would be very troublesome for me.” 1

“To kill Tsukishiro, the price is to inherit his throne of order... but you can rewrite the ending.” 26

“This is what life is supposed to look like.” 29