Shiina Hiyori

Biodata

Feature	Information
Name	Shiina Hiyori (椎名日和)
Gender	Female
Affiliation	First-Year Class C; reading club with Hoshino Kanade and Ayanokoji Kina 11
Occupation/Role	Student; Class C intermediary and strategist 11 25
First Appearance	Cafeteria 5

Background / History

Shiina spends much of her time in the library and is drawn to Hoshino Kanade and Ayanokoji Kina after seeing them select mystery novels on their first day. Although she wants to approach them, her introversion and their apparent closeness make her hesitate. Instead, she begins planning a convincing “chance encounter.” 6

Her attempts fail because Hoshino’s library routine is unpredictable and he is seldom alone. Shiina eventually abandons her elaborate setup and directly introduces herself to Hoshino, beginning their friendship through discussions of mystery fiction. 10

Hoshino later includes Shiina and Kina in a reading club. He entrusts Shiina with intelligence on the school’s first assessment and asks her to act as an intermediary in a one-million-point information trade with Ryuen Kakeru, Class C’s leader. Shiina accepts the task seriously and is pleased to be useful. 11 12

As Hoshino and Kina’s relationship becomes openly intimate, Shiina initially feels excluded from their closeness. She gradually recognizes that books alone cannot satisfy her need for connection and resolves to engage with others despite her fear of rejection. 21 22

Before the midterms, Shiina chooses to continue studying with Hoshino and Kina despite the attention their cross-class friendship attracts. When the library becomes too distracting, she joins them in Hoshino’s dorm room. 25 26

On the school cruise, Shiina takes the initiative to invite Hoshino and Kina to spend their supposed island vacation together. She later offers Hoshino her cool hand to help with the heat, which he accepts with Kina’s tacit approval. 43 46

Appearance

Shiina has long silver-white hair and purple eyes. Her slender figure, simple uniform, and quiet manner give her an elegant, scholarly presence. 5

• Long silver-white or silver-gray hair 5 43
• Deep purple eyes 5 43
• Slender build 5
• Often carries and reads mystery novels in the library 6 10

Personality

Shiina is introverted, gentle, and highly self-conscious in unfamiliar social situations. She carefully rehearses ways to approach potential friends rather than acting impulsively, but her persistence eventually allows her to form a connection with Hoshino. 6 10

Books, especially mysteries, are initially her primary refuge. Her friendship with Hoshino and Kina pushes her to confront her loneliness and fear of intimacy; she comes to value connection without trying to displace either of them. 21 22

Despite her quiet demeanor, Shiina can be proactive when it matters. She accepts Hoshino’s confidential assignment, continues associating with him despite Class C’s scrutiny, and openly invites both him and Kina to spend time together on the island. 11 25 43

Abilities & Skills

Mystery Novel Knowledge

Shiina is an avid and well-read mystery-fiction enthusiast. Her shared interest in the genre forms the foundation of her friendship with Hoshino.

• Discusses works including The Tragedy of Y and analyzes details such as the disappearing murder weapon and stage-light timing. 10
• Shares Hoshino’s interest in logical structures and literary deduction. 11
• Refers to herself as Hoshino’s “Watson” when accepting his request for help. 11

Observation and Analysis

Shiina notices subtle abnormalities in the school and can draw informed conclusions from limited evidence.

• Recognizes the unusual reactions of upperclassmen toward students using the Free Meal Set. 5
• Detects hidden problems in the point system early in the term, contributing to Class C’s ability to preserve points. 25
• Is regarded within Class C as a key strategist, second only to Ryuen in standing. 25

Information Mediation

Shiina can handle sensitive exchanges between classes without exposing Hoshino’s involvement.

• Carries Hoshino’s assessment intelligence to Ryuen for a proposed one-million-point trade. 11
• Understands that the transaction is intended to protect the reading club’s ability to maintain its daily life. 11
• Offers to provide further useful information in exchange for one million points after being inspired by the operation. 12

Relationships

• Hoshino Kanade — Fellow mystery reader and close friend. Shiina deliberately seeks him out in the library, becomes his book-discussion partner, and later develops feelings complicated by his relationship with Kina. 10 21 22
• Ayanokoji Kina — Fellow reading-club member. Shiina is initially intimidated by Kina and feels separated from Hoshino by their intimacy, but later seeks connection with both of them. 11 21 22
• Ryuen Kakeru — Class C’s recognized leader. Shiina serves as Hoshino’s intermediary for a confidential information trade with him. 11
• Class C students — Her classmates recognize her as a perceptive strategist; their attention toward her friendship with Class D students initially concerns her, but she refuses to let it dictate her choices. 25

Story Role / Major Arcs

Library Friendship Arc

• Notices Hoshino and Kina’s shared interest in mystery novels and begins planning a way to meet them. 6
• Directly introduces herself to Hoshino after her staged encounters repeatedly fail. 10
• Joins Hoshino and Kina’s reading club. 11

Information Trade Arc

• Accepts Hoshino’s request to convey intelligence about the first assessment to Ryuen. 11
• Treats the assignment as an important act of trust and finds creative inspiration in the group’s operations. 11 12

Connection Arc

• Realizes that her attachment to Hoshino and Kina reflects a desire for warmth and belonging rather than mere intellectual admiration. 21 22
• Continues studying with the pair despite cross-class scrutiny and shares Hoshino’s dorm room as a study space. 25 26

Island Exam Arc

• Invites Hoshino and Kina to spend the island “vacation” together before the survival exam is revealed. 43 48
• Offers physical comfort to Hoshino during the heat of disembarkation, openly expressing her care while respecting Kina’s response. 46 47

Notable Quotes

“First-year Class C, Shiina Hiyori. A lover of mystery novels... If we're discussing books, I'd be happy to converse with you anytime.” 10

“It is my honor to serve as Hoshino-san's ‘Watson’.” 11