Sakayanagi Arisu

Biodata

Feature	Value
Name	Sakayanagi Arisu (坂柳有栖)
Alias(es)	Sakayanagi-cat — Chihaya Rei’s nickname for her 4
Gender	Female 4
Affiliation	Advanced Nurturing High School; Class 1-A; Sakayanagi faction 4 21
Occupation/Role	Student; contender for leadership of Class A 21
Family	Daughter of school chairman Sakayanagi Narimori 37 47
First Appearance	Convenience-store encounter involving Kamuro Masumi 4

Background / History

Arisu comes from a wealthy family. Her father, Sakayanagi Narimori, is the chairman of Advanced Nurturing High School; according to him, she had few friends growing up. Although she has not met with him since enrolling, he follows her activities through campus surveillance 37 44 47.

Within Class A, Arisu leads a faction competing with Katsuragi Kohei’s supporters. Some classmates consider her petite build and mobility difficulties unsuitable for leadership, while her supporters recognize her intellect. Katsuragi initially holds a slight advantage, strengthened by information purchased from Chihaya Rei 21 27.

Appearance

Arisu is a petite, fair-skinned girl with short white hair and violet eyes. She presents herself with refined poise, including a formal curtsy when introducing herself to Rei 4.

• Black beret — An intricate accessory worn on her small, round head 4.
• White suspender stockings — Part of her clothing during her first appearance 4.
• Cane — Supports her while walking; Rei explains that her weak heart makes prolonged walking difficult 4 22.
• Faint smile — Her habitual expression inspires Rei’s comparison to a white cat plotting mischief 4.
• Limited physical endurance — Her body is unsuited to strenuous exercise, and standing for long periods burdens her legs 4 36.

Personality

Arisu is calculating, competitive, and outwardly composed. She uses polite speech and an elegant smile even when attempting blackmail or disguising retaliation as generosity. She regards potential followers as pieces to use and takes particular pleasure in encountering an opponent who can disrupt her plans 4 5 27 36.

Her pride is especially sensitive to comparisons with Katsuragi and suggestions that her father secured her Class A placement. She insists that her father respects the rules and that she will not use his authority against Rei. Her rivalry with Rei becomes a major source of enjoyment: by late June, a day without seeing him makes school feel less interesting to her 21 37 58.

Despite her confidence, Arisu can accept a decisive defeat. After losing three chess games to Rei, she acknowledges his superiority and feels excitement at having encountered someone she considers a genius 59.

Abilities & Skills

Strategic Reasoning

Arisu gathers information through observation and questioning, then uses it to infer other students’ intentions 21 27 35.

• Identifies Rei as the likely anonymous information seller, while admitting that she lacks direct evidence 21.
• Traces Kamuro’s contribution of exam intelligence back to Rei by considering Kamuro’s small circle of acquaintances 27.
• Recognizes that Rei is strengthening Katsuragi’s position to weaken her influence in Class A 27.
• Limit: She mistakes Rei’s refusal to distribute exam answers for a plan to expel weak classmates. His actual indifference makes her attempted countermeasure ineffective 35 37.

Manipulation and Influence

Arisu uses compromising evidence, useful information, and apparently benevolent offers to gain leverage 4 21 36.

• Films Kamuro stealing beer and attempts to make her an obedient subordinate 4 5.
• Threatens to tell Class D that Rei profited by selling information to other classes while withholding it from his own 21.
• Gives Kushida exam answers for free under the pretense that she does not want students expelled; her real aim is to obstruct Rei 36 37.
• Limit: Rei counters her threats by exploiting her lack of evidence, his popularity, and her mistaken assumptions about his goals 5 21 37.

Chess

Chess is Arisu’s strongest game and a major hobby. She has professional training and years of study, favoring rapid development and an aggressive attempt to control the center 58 59.

• Reports no previous defeats among her peers; none of the school Chess Club’s upperclassmen can match her 58.
• Wins 500,000 private points through the Chess Club 44.
• Can converse while playing, though she becomes silent and fully focused when facing serious resistance 59.
• Limit: Rei’s AI-Level Chess Mastery overwhelms her. In their third game, he defeats her using her own playing style 58 59.

Academic Ability

Arisu has excellent grades and can pass examinations without revision 58.

• Discovers independently that exam answers can be purchased from upperclassmen 27.
• Initially treats those answers as unnecessary for Class A, whose students can pass through their own ability 27.

Relationships

• Chihaya Rei — Her chosen rival and principal source of intellectual excitement. Their encounters involve provocation, schemes, and repeated reversals at her expense. Rumors describe her as pursuing him romantically, but she frames her interest as a desire to defeat him; no romantic relationship is established 5 21 40 58 59.
• Sakayanagi Narimori — Her doting father and the school chairman. He interprets her attention toward Rei as romantic interest, asks Rei to look out for her, and gives him a childhood photograph of Arisu 37 47.
• Katsuragi Kohei — Her rival for leadership of Class A. His information-sharing gains him support from neutral classmates, frustrating her efforts to maintain influence 21 27.
• Kamuro Masumi — A classmate she attempts to recruit through blackmail. Rei prevents that arrangement; Kamuro later helps him undermine Arisu and witnesses their chess match 4 5 25 58.
• Kushida Kikyo — The recipient and distributor of Arisu’s free midterm answers. Kushida accepts her stated benevolent motive and uses the information to claim credit within Class D 36 37.
• Ryuen Kakeru — A rival she openly provokes with the nickname “Dragon Boy.” When he attempts to kick her, Rei intercepts him 53.
• Horikita Suzune — A Class D student Arisu knows through her third-place entrance-exam score. She considers Horikita useful, but not an opponent deserving the attention she gives Rei 36.

Story Role / Major Arcs

Failed Recruitment of Kamuro

On the first day of school, Arisu records Kamuro stealing beer and attempts to use the evidence to control her. Rei intervenes with evidence of Arisu’s own conduct and purchases permission for the beer to be taken out temporarily, undermining the theft accusation. Arisu deletes her recording, and the three exchange contact information. Rather than merely resenting the interruption, she becomes interested in Rei as a more entertaining opponent 4 5.

Class A Leadership Struggle

Arisu visits Class D to question Rei about his anonymous information sales and why he chose Katsuragi as his Class A contact. Rei tells her that Katsuragi is better suited to lead the class, provoking her determination to prove him wrong 21.

Rei subsequently sends midterm answers through Kamuro to Katsuragi, strengthening Katsuragi’s standing. Arisu deduces Rei’s involvement and interprets his effort to suppress her as an acknowledgment of her strength 25 27.

Midterm Counterattack and Sudo’s Rescue

Believing Rei wants weak Class D students expelled, Arisu supplies Kushida with exam questions and answers. She expects Rei to resent having his plan ruined, but he instead thanks her: she has misread his intentions. The answers also prompt Class D to cancel its study sessions and contribute to rumors that Arisu is pursuing him 35 36 37 40.

When Ken Sudo nevertheless fails English, Rei demands 500,000 private points from Arisu to prevent his expulsion. She pays because she wants Sudo to remain a burden on Class D, leaving herself with few points. Although she recognizes that Rei has outplayed her, she attributes the outcome to Class D’s unexpectedly poor performance 44.

Ryuen’s Search for the Information Seller

Arisu joins the spectators when Ryuen confronts Class D. She refuses to expose Rei, declaring that he is an opponent she has chosen for herself rather than someone to hand over to Ryuen 52.

Her subsequent teasing causes Ryuen to attempt an attack, which Rei stops. As Rei attracts attention from other class leaders afterward, Arisu feels sidelined and becomes uneasy about Ichinose Honami’s interest in him 53.

Three Consecutive Chess Defeats

In late June, Arisu challenges Rei at the library and invites Kamuro to watch. They agree to a best-of-three match in which the winner may make a request of the loser 58.

Rei wins the first two games, then grants her an additional game despite already securing the match. Arisu loses again, this time to an imitation of her own style. She accepts the gap between their abilities and withdraws her claim that she can “bury” him. The provided chapters do not reveal Rei’s requested reward 59.

Notable Quotes

“The least likely is often the most likely.” 21

“You are an opponent I have set my sights on; I have no intention of handing you over to Ryuen.” 52

“Chihaya-kun, I am convinced of my defeat in this match.” 59