Sakayanagi Arisu

Biodata

Feature	Value
Name	Sakayanagi Arisu (坂柳有栖)
Alias(es)	ALICE, Little Princess; mockingly called “Nepo Baby,” “Connection-Hire,” and “Civil War Phantom God” in the Diary 19 21 93
Gender	Female 25 130
Affiliation	Advanced Nurturing High School; initially First-Year Class A, subsequently Class B; later appears as a Class A student 25 39 333
Occupation/Role	Student, leader of the Sakayanagi Faction, class leader, and Diary-copy holder 53 67 203
Family	Daughter of school chairman Sakayanagi Narimori 174 190
Health	Born with congenital heart disease; later receives medicine that substantially improves her condition 261 285 287
Status	Alive; present at school in the latest supplied appearance 333
First Appearance	Chapter 1 1

Power Progression

Stage / Realm / Level	Chapter	Notes
Diary Skill section unlocked	92	Gains access to a personalized Skill page. Her initial ratings are Civil War: 77, Hopeless Romantic / Love-struck Brain: 70, and Connections / Nepo Baby: 60 92 93.
Hopeless Romantic / Love-struck Brain: 70 → 71	93	Spends 10 Reading Points to add one point. No specific resulting ability is documented in the supplied passage.
ALICE: 10	307	Upgrades ALICE to 10 and transforms into a magical girl, drawing on her childhood interest and Toru’s liking for magical girls.

Background / History

Family and health

Arisu grows up as the daughter of Advanced Nurturing’s chairman, within a family whose influence extends across successive generations of school leadership. She insists that her original placement in Class A reflects her own ability and angrily rejects the Diary’s allegation that her father spent twenty million points to place her there 19 174 271.

Her congenital heart disease limits her mobility and independence. She uses a cane, relies on Kamuro Masumi for physical support and daily assistance, and keeps Masumi on the phone while bathing as a precaution against fainting. Emotional distress can also affect her breathing, requiring her to regulate her reactions carefully 39 40 67 190.

Class leadership

Arisu builds a faction comparable in strength to Katsuragi Kohei’s. After her class falls from A to B, she uses the first month’s exam failure to strip Katsuragi of authority. His faction subsequently agrees not to interfere with her decisions, leaving her temporarily the class’s sole leader 53 67 118.

She regards the demotion as temporary and continues to think of herself as belonging in Class A. Recovering the ranking remains a central objective during the Uninhabited Island Special Exam 53 166.

Appearance

Arisu is a petite, delicate girl with silver-white hair, fair skin, and a frail build. Her small stature makes even her fiercest expressions resemble a kitten’s display of temper to observers 19 25 42.

• Silver-white hair — one of her most immediately recognizable features 25 42.
• Walking cane — accompanies her throughout many school appearances, including the later classroom confrontation 25 264 333.
• Small, soft hands — Toru remarks that her hand feels closer in size and delicacy to a younger child’s 188.
• Elegant smile — frequently maintains a composed expression even while concealing irritation or refusing to engage with classmates 191 264.

Personality

Arisu is proud, competitive, and strongly invested in proving her intelligence. She prefers discovering answers through her own deductions rather than having them handed to her. Initially, she treats the Diary’s identity game as entertainment and casts herself as the hunter rather than someone who needs to hide 1 25 28.

Her composure is vulnerable to attacks on her independence and family background. Accusations of nepotism anger her particularly because they undermine both her achievements and her father’s impartiality. She holds grudges, mentally records offenses against the Diary’s author, and eventually discovers that swearing provides a satisfying outlet for frustration 19 20 93 124.

She can be domineering toward subordinates, treating classmates as pawns and warning Masumi against prying into her “master’s” communications. Yet her later withdrawal is not simply indifference: she becomes trapped between preserving her dignity and obtaining freedom from her illness 28 83 261.

After receiving heart medicine, her subdued resignation gives way to playful confidence and eagerness to explore her body’s capabilities. Her attachment to Toru remains something she questions before ultimately accepting her feelings and choosing the ALICE transformation 287 288 307.

Abilities & Skills

Intelligence and deduction

• Academic strength — her Academic Ability is described as outstanding, with intelligence among the best of ordinary students 177.
• Clue analysis — examines the Diary’s vocabulary, narrative perspectives, and references to classmates to identify its writer 20.
• Predictive reasoning — deduces that Ryuen intends to occupy her class’s stronghold after considering Masumi’s radio report 171.
• Limits — becomes convinced that Wang Meiyu is the writer and repeatedly interprets contradictory behavior as excellent acting before recognizing her mistake 25 28 39.

Leadership and negotiation

• Faction building — gathers enough support to rival Katsuragi, then exploits his faction’s setback to consolidate authority 67 118.
• Remote command — directs island-exam operations from the cruise ship through walkie-talkies 163 166 181.
• Resource bargaining — obtains a supply list worth 75 exam points for 1.5 million Private Points, estimating roughly 50 points in avoided losses 165.
• Limits — prolonged silence and absence leave followers uncertain, provoke complaints, and weaken Hashimoto’s loyalty 223 261 265.

Diary access and Skill allocation

• Reading rewards — receives Reading Points after completing entries 28.
• Skill upgrades — can spend Reading Points on the Diary’s personalized Skill ratings 93.
• Disclosure restriction — discovers that attempts to discuss the Diary are distorted for outsiders, preventing ordinary disclosure of its contents 39.
• Limits — possessing a copy does not protect her from the writer’s false leads or dream manipulation 82 197 202.

ALICE transformation

• Magical-girl form — obtained by raising ALICE to 10 307.
• Motivation — combines a childhood interest in magical girls with her acceptance of her feelings for Toru 307.
• Documented scope — the supplied account establishes the transformation but does not specify its combat abilities 307.

Equipment / Items

• Walking cane — supports her mobility; she also taps it against the cruise-ship deck while thinking 25 171.
• Diary copy — updates with new entries, returns after she throws it away, and remains readable in bathwater 20 67.
• Walkie-talkie — used to negotiate through Masumi and coordinate classmates during the island exam 163 181.
• Sweet Dreams Charm — uses it on herself to enter a dream; Toru, bound to the charm, constructs the experience 197.
• Personalized heart medicine — a single unmarked white pill intended specifically for Arisu, presented by Toru as a belated birthday gift 271 285.

Relationships

• Sakayanagi Narimori — Father and school chairman. Arisu defends his impartiality; he publicly reprimands her exam conduct but immediately prioritizes her health when she struggles to breathe 19 190.
• Asakusa Toru — Adversary who repeatedly deceives and provokes her through the Diary, later becoming a romantic and intimate partner. He gives her heart medicine, while their later exchanges retain a teasing, challenging quality 82 224 285 287 290 332.
• Kamuro Masumi — Closest attendant and subordinate. Arisu catches her stealing and puts her to work, promising excitement; Masumi handles support, protection, and errands, eventually beginning to regard her as a friend. Arisu later transfers her to Class A 273.
• Katsuragi Kohei — Rival faction leader whose authority she dismantles after the first exam failure. Despite their rivalry, he helps stop a classmate from grabbing her at Forest School 67 264.
• Ryuen Kakeru — Rival who exploits her sensitivity to nepotism, forcing a compromise over the legal dispute involving Kito. Their island-exam conflict escalates through reports, contraband, and stronghold occupation 120 121 166 170 171.
• Wang Meiyu — Innocent target of Arisu’s mistaken investigation. Arisu’s handshake is intended as a declaration of victory and warning, but her later questioning exposes the error 25 39.
• Ichinose Honami — Initially someone Arisu considers undermining through Toru’s affection. Later becomes the person she deliberately seeks out at Forest School to discuss defeat and pride 132 264 270.
• Horikita Suzune — Negotiating counterpart and fellow Diary holder. Direct interaction at the training camp leads Suzune to reconsider the Diary’s belittling portrayal of Arisu 163 165 203 270.
• Hashimoto Masayoshi — Subordinate whose intrusive questions embarrass her. He later loses faith in her leadership after the island defeat and her withdrawal 45 121 265.
• Kito Hayato — Subordinate whose violent incident prompts negotiations with Ryuen. Arisu later punishes him after reviewing the island-exam outcome 120 192 223.

Story Role / Major Arcs

The Diary identity game

Arisu’s initial amusement turns into a personal investigation when the Diary attacks her Class A placement and family connections. Linguistic clues lead her to Wang Meiyu, whom she confronts with complete confidence. The mistake becomes public embarrassment, including rumors about her sexual orientation that Hashimoto later repeats to her face 19 20 25 39 45.

Her investigation continues despite that failure. One false lead about Toru leaving school costs her 500,000 Private Points; she had prepared to pay any false-report penalty rather than invoke her father’s authority 82.

Uninhabited Island Special Exam

Commanding from the ship, Arisu bargains for supplies and orders Masumi to report Ryuen’s cheating. The report results in contraband being discovered, but Ryuen retaliates against her class’s stronghold. Arisu then searches for rule loopholes to recover the situation 165 166 170 171 181.

At the subsequent disciplinary meeting, her father distinguishes legitimate reporting from using unsupported reports and teachers to interfere with another class’s examination. Arisu rejects the reprimand and becomes so distressed that her breathing deteriorates 190.

The constructed dream and withdrawal

After using the Sweet Dreams Charm, Arisu experiences a manufactured life as Asakusa Arisu, a struggling succubus whose father is Toru. The dream places her on the disadvantaged side of scholarship favoritism, bullying, and eventual expulsion through a Class Vote. These are dream identities and events, not her actual species or parentage 197 198 199 200 202.

Recognizing the writer’s control over dreams leaves her feeling powerless. The possibility that he could heal her heart forces her to weigh dignity against freedom. She stops answering messages and largely withdraws from class leadership, the Sports Festival, and special-exam participation 202 218 260 261.

Surrender, recovery, and ALICE

Arisu attends Forest School to face herself and Toru rather than continue avoiding them. She joins Ichinose’s group and eventually admits defeat during a late-night conversation 264 270.

Toru’s belated birthday gift addresses the illness behind much of her isolation. As the medicine takes effect, she becomes visibly healthier, more energetic, and interested in testing her physical limits. Their relationship develops into intimacy, and she later embraces the Diary’s transformation system by upgrading ALICE 285 287 290 307.

Later classroom confrontation

Arisu remains capable of challenging Toru’s plans rather than simply agreeing with him. When he proposes borrowing her seat in Class A, she suggests another seat and questions whether he intends to participate rather than merely watch. During the ensuing occupation of the classroom, she directs students back to their seats and explains the risk of conduct-point deductions 332 333.

Notable Quotes

“Let's just treat it as a side show before burying the fake genius.” 1

“Good afternoon, defective products.” 25

“I cannot accept that.” 190