Sakayanagi Arisu

Biodata

Feature	Value
Name	Sakayanagi Arisu (坂柳有栖)
Alias(es)	Arisu; Alice / Little Alice; Princess / Princess of Class A—names used by Amasawa Reigetsu 7 10 12 23
Gender	Female 3 32
Affiliation	Tokyo Metropolitan Advanced Nurturing High School, Class 1-A; Sakayanagi Faction 3 6 33
Occupation/Role	Student; leader of one of Class A’s two rival factions; chess champion 6 10
Family	Daughter of school chairman Sakayanagi Narimori 4 6
First Appearance	Chapter 3 3

Background / History

Arisu visited the White Room with her father before enrolling at the Advanced Nurturing High School. Her diary records the visit, and a flashback establishes her early encounter with Ayanokoji Kiyoko. She also met Amasawa Reigetsu there, although he recalls having spoken to her only once before their school reunion 3.

During that earlier meeting, Arisu asked Reigetsu who was stronger, him or Ayanokoji. His joking answer remained vivid in her memory. She came to regard him as a true genius favored by heaven and treasured the cane he had made as a child 5 11.

By the time of the school’s club orientation, Arisu was already known as the previous year’s National High School Chess Championship winner 10.

Appearance

• Hair: Silver-white, described in one scene as pale purple at the nape of her neck 6 10.
• Eyes: Described as violet and, during the chess-club encounter, grey-blue 6 10.
• Complexion and features: Fair skin and a delicate, doll-like face; her first appearance compares her to cracked porcelain 3 10.
• Accessories: Carries a black cane and wears a hat 12 22.
• Stature: Considerably shorter than Reigetsu, a difference she uses when leaning toward him to tease him 10.

Physical Condition

• Arisu has poor health and a fragile cardiovascular system. Intense excitement causes rapid breathing, sweating, and an elevated heart rate 6 24.
• During the entrance ceremony, Reigetsu uses mental induction to calm her when she appears close to fainting 6.
• Her limited strength makes her kicks and attempts to push Reigetsu away ineffective 10 32.
• Her condition makes reaching the rooftop inconvenient and contributes to her absence from the uninhabited-island exam 27 33.

Personality

Arisu usually presents herself with a gentle smile, measured speech, and an air of effortless control. As a faction leader, she is openly competitive and dismisses Katsuragi’s refusal to abandon classmates as “the thinking of a loser.” She treats the conflict between Classes C and D as an opportunity to attack both rivals rather than a reason to help them 6 27.

Her treatment of Kamuro reveals a more coercive side: she exploits Kamuro’s theft to recruit her, imposes demanding study work, and disciplines her harshly. This controlling manner disappears when Reigetsu teases her, leaving her visibly flustered 12 13 23 26.

Arisu initially frames her bond with Reigetsu as companionship between soulmates following the same path. Seeing him with Kiyoko forces her to confront jealousy and romantic attachment. Her usual composure repeatedly gives way to embarrassment, impulsiveness, and possessiveness around him 23 24 27 32.

Abilities & Skills

Chess

Arisu is an accomplished competitive chess player whose reputation is recognized by the school’s chess-club president 10.

• Won the previous year’s National High School Chess Championship 10.
• Challenges Reigetsu during club orientation, playing White and opening with e4 10.
• Wants to catch up to Reigetsu’s chess ability and continues playing occasional games with him during their first month at school 10 13.

Strategic Analysis and Leadership

Arisu uses information, leverage, and personal influence to strengthen her faction.

• Recognizes the cafeteria’s free-service window as a warning that students’ initial abundance of points will not last 7.
• Shares information about the other classes with Reigetsu and closely follows his intended actions 7.
• Gains an advantage over Katsuragi by announcing that the first special exam has already begun 11.
• Deduces that the cruise will involve deserted-island survival and considers the danger posed by areas outside surveillance 32.
• Arranges for Reigetsu to represent her faction during the island exam when she cannot participate 33.

Academic Coaching

• Organizes library study sessions and assigns Kamuro extensive mathematics work 13 23.
• Creates a mock exam on which Kamuro scores 78 and Morishita Ran scores 91 21.
• Enforces study-session discipline, including removing Reigetsu and Ran when their joking becomes disruptive 21.

Equipment / Items

• Black cane — Made by Reigetsu during childhood and engraved with his name. Arisu uses it for support and deliberately places its engraved side toward Shiina Hiyori during their library meeting 5 11 22.
• Student terminal — Issued during homeroom; used to contact Reigetsu and invite him to club orientation 4 9.
• Yacht guest-room key cards — Obtains a private-room card from her father, has a spare copied, and swaps Reigetsu’s assigned card with that spare so they will share her room 32.

Relationships

• Amasawa Reigetsu — Former White Room acquaintance, intellectual companion, and later lover. Their school reunion develops through lunches, chess, her first kiss, and a rooftop exchange of feelings. He represents her faction in the island exam 3 7 10 24 27 33.
• Ayanokoji Kiyoko — White Room acquaintance whom Arisu regards as her nemesis, as well as a romantic rival. Kiyoko’s blunt challenges provoke Arisu into acknowledging and acting on her feelings for Reigetsu 3 23 24.
• Sakayanagi Narimori — Father and school chairman. He worries about her health and her attachment to Reigetsu, but grants her a private yacht room 6 32.
• Katsuragi Kohei — Rival faction leader within Class A. Their disagreement centers on how to treat classmates, and the island exam threatens to shift their factional balance 6 33.
• Kamuro Masumi — Recruited through leverage over her stealing habit; subjected to Arisu’s strict tutoring and discipline. Kamuro eventually seeks comfort from Reigetsu after being tormented by her 12 13 23 26.
• Hashimoto Masayoshi — Vocal supporter who backs her classroom announcement and helps bring Kamuro to a study session 11 13.
• Shiina Hiyori — Fellow admirer of Reigetsu. Arisu scrutinizes their connection and subtly displays her cane’s engraving during their library meeting 22.

Story Role / Major Arcs

Class A’s Opening Power Struggle

• Reunites with Reigetsu in Class 1-A, attracting classmates’ attention with her unusually fervent interest in him 3.
• Establishes a faction opposed to Katsuragi’s and takes responsibility for Class A affairs while Reigetsu pursues interactions with other classes 6 7 11.
• Recruits Kamuro and oversees intensive academic preparation before the midterms 12 13 21 23.

Romance and Rivalry

• Encounters Reigetsu and Kiyoko together at a café, becoming unsettled by feelings she cannot reconcile with her supposed purely intellectual partnership 23.
• Gives Reigetsu her first kiss after Kiyoko challenges her relationship status, then flees in embarrassment 24.
• Meets him on the rooftop after the midterms, where their exchange of feelings establishes their romantic relationship 27.

Cruise and Uninhabited-Island Exam

• Engineers a room-sharing arrangement with Reigetsu, imagining the trip as a government-funded honeymoon 32.
• Finds Kiyoko with him instead, leading to another jealous confrontation 31 32.
• Places her confidence in Reigetsu before the island exam. Her absence gives Katsuragi the initiative, while Reigetsu explicitly declares that he will represent the Sakayanagi Faction 33.

Notable Quotes

“But that is the thinking of a loser.” 6

“No! I won’t lose this time!” 24

“As long as you are by my side, Rei-kun, the victory of this trial will surely be mine~” 33

Trivia

• “Alice” originates from Reigetsu’s English-language wordplay on Arisu 10.
• Her usual café order is a cappuccino with two packets of white sugar 24.
• In her first-person account, she says she returns to her dorm before eight, goes to bed at eleven, ensures eight hours of sleep, and neither smokes nor drinks 32.
• A fourth-wall joke has her explain an unusually quick return to class as teleportation becoming available with the chapter change 6.