Shimiya

Biodata

Feature	Information
Name	Shimiya Kuki (四宫)
Alias(es)	King Rider; Moon
Species/Race	Human
Gender	Male
Affiliation	Tokyo Koudo Ikusei High School; Class 2-A (formerly Class 1-B)
Occupation/Role	Student; Class A strategist and core member
First Appearance	Chapter 1

Background

Shimiya entered Tokyo Koudo Ikusei High School with exceptional academics, severe scars, and an emotionally suppressed demeanor. During his admission interview, he stated that he wanted to find his missing emotions and become whole; Director Yanagi subsequently placed him in Class 1-B as an environment where he could recover and grow 1.

Before taking the name Shimiya Kuki, he was known as Moon, an injured and amnesiac youth rescued at sea by sea-patrol officer Shimiya Aohiko. Initially wishing to die rather than confront the mistakes of his past, Moon accepted Aohiko's encouragement to begin anew and adopted the name Shimiya Kuki 156.

Ichinose Honami's kindness elicits one of Shimiya's earliest faint emotional responses. Over time, Class 1-B becomes the foundation of his recovery, with Shimiya supporting Ichinose's leadership rather than seeking to replace her 1 259.

His past is later revealed to be tied to Night Abyss, an institution that cultivates people into “weapons.” His family guaranteed his enrollment, though one family member had once been his Night Abyss target. Tsukishiro Tokinari was also an investor in organizations like Night Abyss, making him Shimiya's personal target 317 319 320.

Much of Shimiya's background has been deliberately erased from official records; the remaining file reportedly contains little beyond basic enrollment information. Even Tsukishiro's investigation was unable to uncover meaningful details concerning Shimiya's family, history, or enrollment guarantor 543 563.

Appearance

Shimiya is a tall, fair-skinned youth with refined features, deep black hair, and distinctive ice-blue eyes. His normally sharp, controlled presence becomes notably gentler when he is with Ichinose 271 488.

• Hair: Deep black, occasionally falling across his forehead 271.
• Eyes: Ice-blue; typically calm, precise, and difficult to read 186 271. When his Moon state emerges, they become an unnervingly dark blue and appear devoid of emotion 526 535.
• Scars: Has numerous scars across his body, including a long, clean wound beneath his left ribs that appears to have been inflicted by a bladed weapon 264.
• Uniform: Wears the school's dark red uniform jacket 273.

Personality

Shimiya is calm, detached, and exceptionally observant. He speaks concisely, often framing even dangerous situations as probabilities, strategic variables, or objective facts. His classmates initially find his help efficient but emotionally distant 15 29.

Despite this cold exterior, Shimiya is not driven by recognition or control. He consistently supports Ichinose rather than taking over Class A, aids students outside his class when he sees a viable solution, and quietly protects people he considers important 34 253 259.

His restraint has limits. When confronting threats such as Sakayanagi's rumor campaign or Tsukishiro's interference, he demonstrates a calculating and ruthless side, using public pressure, recorded evidence, intimidation, and carefully controlled violence to force an outcome 165 317 320 570.

Under extreme pressure, Shimiya can enter a state associated with his former identity, Moon. In this state, his dark-blue eyes, absolute rationality, and emotional detachment frighten even trained opponents; Shimiya himself questions whether “Shimiya Kuki” is his genuine self or an identity created to survive 526 535. Even then, he retains enough awareness to entrust Ichinose's safety to Tsurumi and avoid allowing her to see him in that condition 535.

Abilities & Skills

Academic Ability

Shimiya is among the school's strongest students academically.

• Earned a perfect score on a quiz and regularly tutors classmates in mathematics and physics 15 23.
• Gives concise explanations supported by diagrams and formulas, focusing on the core of a problem rather than lengthy instruction 15.
• Ranked first in his grade under the OAA system, with an Overall Ability score of 91 373 374.
• Rapidly mastered chess from a beginner's level, surpassed Shiina Hiyori after four days of study, and defeated Sakayanagi in the Command Tower Exam 275 276 301.

OAA Category	Recorded Information
Overall Ability	91 373
Grade Ranking	1st place 374

Analysis and Deduction

Shimiya rapidly processes information, identifies hidden motives, and anticipates opponents' actions.

• Identified Class C as the likely orchestrator of the Sudo Incident by analyzing the location, evidence, and Ryuen's methods 29.
• Recognized classmates' handwriting from routine homework, notes, and sign-up sheets 32.
• Exposed Kaneda as a Class C spy during the Survival Exam and negotiated directly with Ryuen afterward 58.
• Detected the loophole in the Deserted Island Exam's GPS evidence, delaying judgment against Komiya and Kinoshita 502.
• Deduced the scheme targeting Tachibana Akane and the larger Class Point loss it could inflict on third-year Class A 207.
• Identified Yagami as the likely attacker of Kinoshita and Komiya by assessing Ryuen's injuries and observing Yagami's combat ability 544.
• Can analyze an opponent's stance, force generation, habitual tells, and attack sequences in real time, allowing him to predict and neutralize Yagami's karate, judo, and boxing combinations 544.

Strategy and Leadership

Shimiya serves as Class A's primary strategist and a trusted field leader.

• Was chosen as Class B's leader for the Survival Exam due to his wilderness experience; he immediately prioritized base selection and supply inventory 45.
• Helped establish a highly organized camp that shocked Class D observers with its shelters, decorations, and efficient operations 53.
• Coordinated Class B and Class C's preparation during the Sports Festival, effectively integrating both classes' training and tactical planning 102 104 108.
• Developed an evaluation system for Class D after Yamauchi's expulsion, helping Hirata accept a more active leadership role 253.
• Used Ozawa Natsumi as a double agent in the Mouse-Elephant Game, manipulating Ishikura into actions that secured Class D's victory 364.
• Calculates probable outcomes when selecting leadership positions and agreed to support Ichinose from behind the scenes after determining that her rapport with the class and Protection Points made her the safer commander 258.
• Deliberately accepted Tsukishiro's stun-baton attack to establish that Tsukishiro had attacked first, securing both legal justification and recorded evidence for his counterattack 570 571.

Combat Ability

Shimiya possesses exceptional close-quarters combat skill, likely shaped by his Night Abyss training.

• Claims that no student at the school can defeat him in kendo 264.
• Corrected the Class A karate group's posture and force application during training 268.
• Defeated Ryuen effortlessly during their rooftop challenge, then became his long-term combat instructor 177 201 444.
• Eliminated Katsuragi and Kito in rapid succession during the Sports Festival's mounted warfare event through exceptional balance, reaction speed, and precision 119.
• Defeated six third-year students—including karate and judo practitioners—in under two minutes during the Deserted Island Exam 523 527.
• His presence can induce intense fear; when revealing Night Abyss, he created a palpable threatening atmosphere that shocked teachers and students alike 317.
• Remained composed enough after defeating the six students to seize their walkie-talkie, warn Nagumo, and leave without being recorded attacking first 526.
• Easily evaded and defeated Yagami Takuya, dislocating his wrist and knocking him unconscious after reading his techniques in real time 544.
• Overpowered Tsukishiro in a direct confrontation, incapacitating a mercenary who intervened and ultimately dislocating Tsukishiro's limbs after using the stun-baton strike as bait 566 570.
• His Moon-state presence was sufficient to halt the fight between Ayanokoji, Kiryūin, Tsukishiro, and Shi Ma Kedian, causing Tsukishiro and the staff on the nearby yacht to react with visible alarm 563 565.

Athletic Ability

Shimiya possesses elite overall physical ability and can adapt rapidly to unfamiliar sporting tasks.

• Stopped Sudo's full-force charge during the Sports Festival, demonstrating strength Sudo considered comparable to Kouenji's 115.
• Maintained efficient movement and stable breathing over a difficult relay segment, overtaking Ishizaki and securing first place for his group 209.
• Won a relay swimming assignment alongside Ryuen, earning ten bonus points 495.
• Reached second place in a mountain-arrival task with Ryuen despite the demanding ascent 498.
• Defeated multiple students, including a third-year tennis-club member, before winning an extended tennis final against Kouenji 508.
• Possesses high stationary-shooting accuracy and demonstrated strong archery ability during the Deserted Island Exam 264 488.

Survival and First Aid

• Has prior wilderness survival experience and used it to lead Class B in the first-year Survival Exam 45.
• Scouts opposing camps and organizes supplies, bases, and daily camp operations 45 53.
• Performs emergency treatment for injured students during the cross-grade Deserted Island Exam 504.
• Reduced Kinoshita's injured wrist quickly and precisely after the attack on her group 500.
• Assessed Ryuen's injuries after Yagami's assault, identifying the severity of his wounds and the expected recovery period 544.

Information Control

• Transferred 30,000 Personal Points to Ayanokoji rather than exposing Class B's collective account during Class D's monitor plan 34.
• Maintains contacts with upperclassmen to collect intelligence on students, examinations, and school affairs 192 358.
• Played a recording of Sakayanagi denying involvement in Ichinose's rumors, exposing her lie before the first-year students 165.
• Used an earbud and a network of informants during the Mouse-Elephant Game to monitor reports and coordinate intelligence operations 358 363.
• Concealed a tablet recording device during his confrontation with Tsukishiro, preserving evidence of the acting chairman's actions for the arriving teachers 571.

Equipment & Personal Items

• Portable terminal — Used for point transfers, research, secure communication, and intelligence gathering 34 132 358.
• Books — An avid reader who spends free days immersed in books and exchanges books with Shiina Hiyori 136 177.
• Guitar — Played guitar during a class celebration 271.
• Trekking pole — Uses one during the cross-grade Deserted Island Exam and employs it to guide Ryuen's footing on difficult terrain 497.
• Hidden tablet — Used to record the confrontation with Tsukishiro and preserve evidence of the acting chairman's misconduct 571.

Relationships

• Ichinose Honami — Classmate, class president, and romantic partner. Ichinose's kindness first stirs Shimiya's suppressed emotions; they later become openly affectionate and continue supporting Class 2-A together. Shimiya considers her the person he cannot bear to lose, while Ichinose is determined not to let him shoulder every danger alone 1 186 233 258 371.
• Kanzaki Ryuji — Close classmate and intellectual counterpart. Kanzaki respects Shimiya's concise reasoning, assists his class training, gives him a chess set, and seeks his help in challenging Sakayanagi 8 264 268 273 275.
• Ayanokoji Kiyotaka — Initially distant acquaintance from Class D who becomes a strategic ally against Tsukishiro. Their shared institutional backgrounds create mutual caution and understanding; they later cooperate directly against Tsukishiro during the Deserted Island Exam 15 34 317 319 504 563.
• Hoshinomiya Chie — Class advisor assigned by Sakayanagi Chairman to “look after” Shimiya. She is openly protective of him, opposes treating him as a dangerous person, and personally tends to his wound after the Tsukishiro confrontation 317 318 321 571.
• Ryuen Kakeru — Rival strategist, combat pupil, and eventual ally. Ryuen spread Shimiya's “King Rider” title, was decisively defeated by Shimiya, and later trained under him to improve his technique and mental discipline. Shimiya regards Ryuen as someone whose safety he is responsible for during the Deserted Island conflict 58 60 177 201 444 504 544.
• Sakayanagi Arisu — Strategic rival. Shimiya publicly dismantles her rumor campaign against Ichinose, then defeats her at chess during the Command Tower Exam 165 273 301.
• Hirata Yosuke — Friend from Class D. Shimiya helps Hirata recover from Yamauchi's expulsion and formulate a system to strengthen Class D 253.
• Shiina Hiyori — Close friend and fellow reader; she visits Shimiya to discuss The Ghost Tower and borrow books. Hiyori also teaches him chess before he surpasses her and challenges Sakayanagi 136 275 276.
• Hiyukie Rua — Third-year contact and intelligence partner. Shimiya shares his analysis of Nagumo's schemes with her, seeks information about upperclassmen, and later agrees to provide assistance to her class during special exams 132 207 359.
• Tsurumi Xuewuhui — A trusted ally who knew Shimiya as Moon and views him as her “one and only moon.” She protects Ichinose, gathers intelligence, and supports Shimiya's efforts against Nagumo and Tsukishiro; Shimiya entrusts her with Ichinose's safety when his Moon state emerges 436 535 547.
• Kiryūin Fūka — Third-year student and occasional ally. She assists Ayanokoji against Tsukishiro's side and recognizes Shimiya as the Moon Tsurumi had described after witnessing his arrival on the beach 498 563 565.
• Nagumo Miyabi — Third-year adversary who attempts to eliminate Shimiya through ambushes, false evidence, and pressure against Ichinose. After Shimiya defeats Nagumo's six attackers, he directly attacks Nagumo and begins pursuing him through the island 523 526 527 549.
• Yagami Takuya — Suspected White Room student and attacker of Kinoshita, Komiya, and Ryuen. Shimiya deduces Yagami's identity, defeats him with little difficulty, and knocks him unconscious 544 547.
• Tsukishiro Tokinari — Personal enemy connected to Shimiya's Night Abyss past. Shimiya identifies Tsukishiro as his target, joins efforts to oppose him, and ultimately defeats him after exposing his attack on students 311 320 566 570 571.

Story Role and Major Arcs

• Enrollment and Class 1-B — Enters the school seeking to recover his emotions and is assigned to Class B by Director Yanagi 1.
• Sudo Incident — Helps Ichinose investigate Class D's conflict with Class C, identifies the likely framing scheme, provides the monitor source, and funds Class D's bluff 29 34.
• First-Year Survival Exam — Leads Class B's wilderness operations, exposes a spy, and negotiates with Class A and Class C leaders 45 53 58.
• Sports Festival — Takes charge of Class B's arrangements and coordinates training with Ryuen's Class C to avoid mutual losses and strengthen both sides 102 104 108.
• Ichinose Rumor Incident — Investigates the source of the rumors, confronts Hashimoto, and uses recorded evidence to expose Sakayanagi's deception publicly 139 152 165.
• Class Poll Aftermath — Reveals that expulsion can be offset under the school rules and becomes a source of hope for his class during the voting crisis 225.
• Training Camp — Leads a cross-class group, assesses its members' strengths, trains Ryuen in combat, and supports the group through the relay events 201 204 209.
• Tsukishiro Conflict — Reveals his Night Abyss background, identifies Tsukishiro as his target, and allies with Ayanokoji to resist the acting chairman's plans 311 317 319 320.
• Second-Year Advancement — Enters Class 2-A, ranks first in the OAA system, and remains the grade's most highly rated student 371 373 374.
• Command Tower Exam — Learns chess intensively under Shiina's guidance, surpasses her within four days, and defeats Sakayanagi to secure Class A's victory in the chess event 275 276 301.
• Cross-Grade Deserted Island Exam — Forms a working partnership with Ryuen, excels in academic, athletic, survival, and practical assignments, treats injured students, and identifies the GPS loophole used in the attacks 495 499 500 502 504.
• Nagumo's Hunt — Is targeted by Nagumo's third-year students, defeats six upperclassmen sent to ambush him, and retaliates by confronting and pursuing Nagumo 523 526 527 549.
• Yagami Confrontation — Assesses Ryuen's injuries, identifies Yagami as the likely White Room attacker, and decisively defeats him 544 547.
• Final Tsukishiro Confrontation — Enters his Moon state, reaches the beach confrontation between Ayanokoji, Kiryūin, Tsukishiro, and Shi Ma Kedian, then defeats Tsukishiro after deliberately drawing out his illegal stun-baton attack 563 565 566 570 571.

Trivia

• Ryuen's promotion of Shimiya's reputation caused the title “King Rider” to spread among the first-years 60.
• Although he is known for detachment, Shimiya reads fiction, watches old films with Ichinose, cooks, and plays guitar 177 233 253 271.
• His records were sufficiently incomplete that Yagami considered his erased history more significant than his visible academic and physical achievements 543.
• Shimiya was formerly known as Moon before taking the name Shimiya Kuki and beginning a new life 156.
• He initially had no formal chess experience, yet surpassed Shiina Hiyori after only four days of intensive training 275 276.