Sakayanagi Arisu

Biodata

Feature	Value
Name	Sakayanagi Arisu (坂柳有栖)
Alias(es)	Cheshire Cat — alternate-account identity; Mad Hatter — nickname associated with her special-exam tactics; Princess — address used by Hashimoto Masayoshi 71 108 397
Gender	Female 7 16
Affiliation	Advanced Nurturing High School; initially Class 1-A, later Class 2-A, and subsequently Class 2-B; Sakayanagi Faction 108 397 554
Occupation/Role	Student; class leader, faction leader, and special-exam command tower 42 261 361
Family	Only daughter of Sakayanagi Narimori, the school chairman; her mother was frail from birth 16
Status	Alive; has congenital heart disease. A possible surgical treatment is discussed, but she decides to wait for safer medical advances 555 593
First Appearance	First on-page encounter in the supplied material: Chapter 4; mentioned in Chapter 1’s opening premise 1 4

Background / History

Arisu was born with a congenital heart defect and spent much of her childhood in hospitals. Playing chess alone became her familiar pastime; she could attend school only after her health improved enough for her doctors to permit it. Childhood bullying included classmates taking away her cane, contributing to her determination that a future partner should possess overwhelming physical strength 16.

Before she enrolled at Advanced Nurturing High School, her father asked her to eventually choose a healthy partner with no family history of genetic disease, hoping that her children would not inherit similar health problems. Although she initially had no interest in romance, Arisu accepted that condition without hesitation. Narimori also wanted her at his school so that he could watch over her 16 207.

Upon entering Class A, she quickly recognized rules the school had concealed from its students. She developed a faction opposed to Katsuragi Kohei’s leadership and privately intended to move against him by the second semester of their first year—far sooner than Katsuragi expected 18 42 52.

Appearance

Arisu has long silver-white hair, pale violet eyes, a delicate face, and a slender, visibly frail build 7 52 202 337.

• Cane: Almost always accompanies her and makes her readily recognizable 88.
• Beret: Worn during her visit to Class D to disclose special-exam information 70.
• Expressions: Frequently wears a faint, mocking or self-assured smile; Akira’s refusal to engage can leave her visibly bewildered or annoyed 5 6.
• Pallor: Becomes especially noticeable when she is emotionally distressed; she also notices her pale reflection before inviting Akira to discuss surgery 337 555.

Personality

Arisu openly believes that differences in talent separate exceptional people from the mediocre. Her confidence comes from both her intelligence and her father’s position. Akira challenges this attitude from their first encounter, but he also observes that she is unexpectedly sincere toward people whose abilities she recognizes 4 7 283.

She approaches competition as a game worth playing only against interesting opponents. She considers herself, Akira, and Ayanokouji Kiyotaka the outstanding talents of their year, and initially prefers keeping Akira in another class so their rivalry does not become internal factional conflict. Mashima describes her as a lone chess player who treats her class as a piece rather than a community 52 109 228.

Her pride is accompanied by pettiness and a willingness to sacrifice immediate advantages. She targets Ryuen through exam questions, distributes valuable information to stop Akira profiting from it, and accepts damage to her reputation when a larger objective requires it. Defeat can expose a colder, hostile side that unsettles her followers 70 109 261 337.

She is less guarded with her father and Shiina Hiyori. Her father’s removal from office makes her visibly emotional, while Hiyori’s concern prompts unusually gentle gratitude. Her growing attraction to Akira also reveals loneliness and jealousy: she resents being left behind while other girls date him, yet later seeks his advice about a deeply personal medical decision 282 337 414 415 555.

Abilities & Skills

Observation and Deduction

• Predicts Kamuro Masumi’s attempted theft down to the second, earning sincere praise from Akira 7.
• Recognizes the school’s hidden rules at the beginning of the school year 18 52.
• Detects a weakness in Class B’s VIP strategy by comparing which groups proposed taking turns to speak and which remained silent 179.
• Infers part of Akira’s arrangement with Chabashira Sae after investigating class fees and his unusual commitment during the island exam 179.
• Acknowledges when evidence is insufficient: Nagumo’s shortlist of suspicious first-years does not let her identify the White Room infiltrator conclusively 397.

Exam Strategy and Rule Exploitation

• Shares exam information to create future bargaining opportunities and discourage the other classes from uniting against Class A 62.
• Obtains advance exam rules through point transactions with a teacher and requests that Kamuro and Akira be placed in the same group 163.
• Uses authority to modify up to five midterm questions, choosing Ryuen as a target 109.
• Coordinates reports across all twelve VIP groups, giving her a broader information base than Akira’s focus on the Rabbit Group 179.
• Arranges most of Class A’s first-year partnerships according to academic ability 397 400.

Chess

• Develops her interest through solitary play during her hospital-bound childhood 16.
• Plans to defeat Ayanokouji in a formal chess match during the end-of-year competition 388.
• Wins the chess event against Horikita Suzune instead, but is dissatisfied that Akira did not field Ayanokouji 377.
• Her chess victory does not secure an overall victory for her class 377 388.

Leadership and Negotiation

• Builds a faction including Yamamura Miki and Kito Hayato while competing with Katsuragi for control 108.
• Assigns work by specialty: Hashimoto handles proactive information gathering, while Yamamura watches and follows targets 397.
• Uses Private Points to motivate students, including Kamuro’s exam cooperation and Sports Festival participation 181 213 252.
• Cooperates with Nagumo despite disliking him, retaining leverage she believes could remove him from the Student Council presidency 337.
• Fails to recruit Shiraishi Asuka, who refuses to join any faction 554.

Health and Physical Limitations

Aspect	Details
Underlying condition	Congenital heart disease, severe enough to require extensive childhood hospitalization 16 202.
Childhood symptoms	Could faint without warning. Her father also recalls slow physical development, easy exhaustion, frequent colds, sweating, bruising after exercise, chest tightness, and breathlessness 207.
Mobility and exercise	Uses a cane; cannot keep up when Akira runs away and is unable to undertake physical exercise normally 5 109.
Improvement in high school	Reports that chest tightness and dizziness occur one-third less frequently than in middle school 207.
Exam restrictions	Cannot attend the first-year island exam for health reasons. During a later island exam, special arrangements allow her to camp near the teachers, but she cannot directly participate in the exam or assignments 130 449.
Emotional strain	Faints during the end-of-year exam period. Subsequent clinic follow-ups find no current problem, but she is advised to avoid becoming angry 397 429.
Possible treatment	Narimori tells her that current technology may be able to cure her condition. After consulting Akira, she decides against rushing into surgery and prefers to wait until success is virtually guaranteed 517 555.

Equipment / Items

• Walking cane — Mobility aid; she also taps it against the floor while speaking or negotiating 4 342 590.
• Mobile phone — Used to direct subordinates, negotiate with rival leaders, and communicate with Akira through separate identities 108 267 282.
• Cheshire Cat burner account — Purchased from her homeroom teacher and used to contact Akira while concealing her identity 108.
• Book about heart disease — Kept beside her bed while she considers surgery 555.

Relationships

• Shimizu Akira — Intellectual rival and romantic interest. Their relationship begins with competing deductions and bets; she later asks him for medical advice and a date if her condition is cured. He answers the date request by quoting a fee of 500,000 Private Points 4 7 109 555.
• Sakayanagi Narimori — Father and central emotional priority. He closely monitors her health; she accepts an alliance with Nagumo to help restore his chairmanship 207 337.
• Shiina Hiyori — Investigator turned friend. Hiyori checks on her after the rumor incident and offers help against Tsukishiro. Arisu values her concern, although she does not consider them close enough to discuss surgery 88 282 336 337 555.
• Kamuro Masumi — Valued athletic collaborator whom Arisu repeatedly tries to bring under her control. Kamuro accepts paid work but resists manipulation and defends Akira against Arisu’s teasing. Arisu explicitly says she is fond of her 63 181 252 315.
• Katsuragi Kohei — Rival for class leadership. They initially divide responsibility for class funds, but Arisu works to weaken his faction. Akira later condemns her for breaking an agreement protecting Katsuragi and Totsuka 42 48 183 412.
• Hashimoto Masayoshi — Versatile subordinate whose usefulness Arisu recognizes despite knowing he is a fence-sitter. She believes her own strength is sufficient to keep him attached to her faction 252 315 397.
• Yamamura Miki — Surveillance subordinate. Arisu assigns her to monitor Katsuragi and Ayanokouji; Yamamura also reports on Ryuen and Hiyori 207 267 282.
• Kito Hayato — Physically capable faction member and enforcer. He stops Manabe Shiho from attacking Arisu after the expulsion vote 108 353.
• Ichinose Honami — Rival whom Arisu targets through exams and the exposure of her past theft. Arisu eventually apologizes; Honami accepts her gesture and gives her homemade cookies 187 252 336 430.
• Ayanokouji Kiyotaka — Desired opponent whose White Room background she knows. She tries to persuade him to transfer classes and investigates what would make him use his full ability; he tells her he has never considered her his opponent 228 237 267.
• Ryuen Kakeru — Rival and recurring target. Arisu temporarily dismisses him after repeated failures, rejects his later Sports Festival proposal, and anticipates intimidation from his classmates 109 282 584 590 593.
• Nagumo Miyabi — Disliked but useful ally. Their agreement exchanges her assistance with his reputation and campaign against Honami for help opposing Tsukishiro 337.
• Tsukishiro Tokinari — Acting chairman and enemy. Arisu holds him responsible for her father’s displacement and seeks to drive him out 337.
• Morishita Ai — Paid bodyguard despite their initial mutual dislike. Arisu offers 200,000 points for protection at the Sports Festival; Morishita successfully stops two girls sent to intimidate her 584 593.
• Kanzaki Ryuji — Elementary-school acquaintance familiar with her methods. He doubts that making her leader guarantees she will act in her class’s interests 190 261.

Story Role / Major Arcs

First Encounters and the Information Trade

• At the convenience store, Arisu tests Akira while both observe Kamuro’s planned shoplifting. When she asks him to hit her twice as an apology for her rudeness, he instead flicks her forehead and challenges her condescending worldview 4.
• Akira initially runs away from her proposed bet, but she continues observing him and eventually learns his name. Her subsequent prediction of the theft earns his respect 5 6 7.
• She obtains information from a graduate senior and becomes involved in the dispute over rented classroom surveillance. Her concern is the potential exposure of students’ habits, conversations, and weaknesses—not merely access to the cameras 29 45 48.
• To block Akira’s exam-information business, she initially asks Class D for 200,000 points, then distributes the material freely to the other classes. The disclosure improves her public reputation while cutting off his opportunity to profit 70 71 109.

Cheshire Cat and the Summer Exams

• Akira’s daily intelligence identifies Arisu as Cheshire Cat, explaining why messages sent under different identities appear inconsistent. She knows his concealed identity but helps keep it secret 108.
• She later admits directly that she is Cheshire Cat, explaining that she cannot lose to a certain “Detective”—Hiyori 128 129.
• Although health restrictions keep her off the island, her preparations influence the exam. Before the subsequent VIP exam, she also requests that Kamuro and Akira share a group 130 158 163.
• During the VIP exam, she exploits Class B’s uneven meeting behavior and pays Kamuro 200,000 points for cooperation. Akira attributes additional deliberate errors to her campaign against the Katsuragi Faction 179 181 183.

Sports Festival and Interclass Challenges

• Arisu proposes an open Sports Festival showdown with Honami, using rewards to secure Kamuro and Kito’s participation 213.
• She summons Akira and Ayanokouji to a café, reveals Ayanokouji’s White Room upbringing, and argues that the three of them determine the balance between the first-year classes. Ayanokouji rejects her transfer proposal 228.
• She negotiates attack arrangements with Hiyori and seeks a contest against Suzune. Honami later counters with a public wager over final-exam totals, granting Arisu’s class a 500-point advantage 235 252.
• After losing, Arisu becomes noticeably colder toward her classmates. She continues pursuing Ayanokouji through surveillance, while her attempts to invite Akira out during winter break are repeatedly rejected 261 267 283.

Honami’s Rumors and the Chairman Conflict

• Arisu exposes Honami’s past theft, but Honami’s public apology and intervention by the Student Council leave Arisu’s class with a 100-Class-Point deduction 336.
• In private, she confirms Hiyori’s deduction that Nagumo was involved. Her principal objective is securing Student Council help against Tsukishiro after false accusations force Narimori out of office 337.
• She warns Akira that Tsukishiro wants either him or Ayanokouji expelled. During the vote, she masterminds Manabe’s expulsion and accepts Totsuka’s removal from her own class 344 353.

Command-Tower Defeat

• Arisu offers Akira’s class advance information about a guaranteed event and one million Private Points to secure a direct confrontation 359.
• Her intended outcome is a chess victory over Ayanokouji followed by an overall 4–3 victory over Akira. Instead, Akira fields Suzune in chess, and Kouenji’s full participation disrupts Arisu’s expectations 377 388.
• She buys Akira’s boxing lineup for five million Private Points but still loses. She later pays the agreed amount, while blaming Kouenji’s intervention and Tsukishiro’s selection of boxing for undermining her plan 378 388.

Second-Year Alliances and Reconciliation

• Arisu investigates possible White Room infiltrators among the new first-years and organizes academically strong partnerships. Nagumo’s shortlist supplies candidates rather than a confirmed identity 397 400.
• Akira visits her dorm to warn her about White Room threats and request Narimori’s contact number. Despite the civil exchange, Arisu remains hurt by Akira’s focus on Honami and her own lack of companionship 414 415.
• She apologizes to Honami and negotiates a trade of five Half-Price Cards for an Extra Member Card. Honami’s gift of cookies surprises her; Arisu later gives Akira cookies as both thanks and a bribe 430 450.

Surgery Decision and Later Sports Festival

• Now in Class 2-B, Arisu proposes producing a cultural-festival guide manual rather than personally operating an attraction. She also unsuccessfully recruits Shiraishi to her faction 554.
• The possibility of curing her heart condition overtakes class affairs as her immediate concern. She asks Akira for advice, expresses regret over experiences she has never had, and ultimately chooses to wait rather than rush surgery 517 555.
• Before the later Sports Festival, she hires Morishita as protection and rejects Ryuen’s proposal that her class subordinate itself to his for one million points. Morishita’s successful defense against Yabu Nanami and Yamashita Saki validates that precaution 584 590 593.

Notable Quotes

“The gap between people is sometimes determined by talent—just like birds in the sky and fish in a pond, destined to live in entirely different worlds. How do you expect me to treat those mediocre people as equals?” 4

“Father’s position is far more important than my personal likes and dislikes.” 337

“I never give insincere apologies.” 430

“If my heart condition is cured, can you go on a date with me?” 555

Trivia

• Cheshire Cat is explicitly named after the character from Alice in Wonderland 108.
• Her favorite coffee is cappuccino. Drinking warm coffee while watching winter scenery is an indispensable part of her winter break 282 336.
• She jokingly revises a claim of achievement through “hard work and sweat” to “hard work and coffee,” acknowledging that her frail body prevents exercise 109.
• Unlike most students in the school’s closed environment, she enjoys frequent access to her family; Kanzaki describes her as able to see them every day 614.