Hiyori Shiina

Hiyori Shiina (ひより) is one of the students of class 2-C who is a loner.

Appearance
Hiyori has mid-back length silver hair that has black ribbons and light purplish eyes.

She is usually seen wearing her school uniform.

Personality
Hiyori is a quiet girl, although she is occasionally seen smiling.

She always carries books with her in her bag in case she meets someone who shares the same interest in literature as her. Since nobody in class 1-C is into literature, she doesn't have anyone to talk to.

She always speaks politely. She dislikes how the classes are competing with each other, wanting everyone to be friends.

She genuinely wanted to befriend Kiyotaka Ayanokōji after he helped her reach for a misplaced book in the library and they started to talk about mystery novels.

Plot
Hiyori made her first debut in Volume 6 when Kakeru Ryūen asked her to accompany him to give her plans for spying D-Class. They started with greeting the members of the Ayanokōji Group who were studying together around a group table. After refilling her coffee cup, Haruka Hasebe dropped the cup on the ground after stumbling over her bag. The coffee cup was then crushed underfoot by Kakeru as the group from C-Class confronted the D-Class students. This caused tensions between the two groups to rise. A few arguments were tossed around and Hiyori was left alone by Kakeru. Hiyori apologized to Haruka for Kakeru's blunder and claimed that she doesn't want to spy D-Class though she's otherwise interested.

As they discussed the identity of "X", the mastermind that works underneath the shadows in D-Class, she intuitively claimed that it probably wasn't Suzune Horikita. Haruka and Akito strongly believed contrarily since nobody in D-Class is superior to her — and that Suzune's the only one that comes to their mind as the possible candidate for X's identity. Hiyori's hunch, though, stems from the scenes where Kiyotaka frequently orbits Suzune whenever their class faces demise and downfall, leading her into an intuitive hypothesis that, perhaps, Suzune's just a cover-up. While Teruhiko snobbishly turned down Hiyori after she "supposedly disturbed" their group's study routine, Haruka instead defended her and expressed her gratitude for replacing the coffee she dropped earlier. Strangely enough, the amount of sugar placed and agitated into Haruka's coffee by Hiyori was similar to the amount Haruka put in, to begin with.

In Volume 7, between the bookshelves under the library's section for the mystery genre, Kiyotaka met Hiyori. While the former was thinking on borrowing another book, he observed a girl who was trying hard to reach the book titled,  by. Kiyotaka helped the girl without realizing that it was Hiyori. After he grabbed the book and gave it to her, the latter expressed her gratitude, and then afterwards, Kiyotaka spontaneously asked whether Hiyori likes Brontë's works or not. She responded by telling that she doesn't have any special preference over the author and she just wants to put the book in the right place, in the right shelf, in the right section of the library.

After her disclosure, with an inquisitive outlook, Hiyori noticed the book titled,  by, that Kiyotaka was holding — the exact book that he had received from Suzune. That book, as Hiyori claimed, was a popular masterpiece that was being borrowed by a lot of sophomores, making the book's availability to be rare. She wanted to re-read it but didn't have the chance to borrow it. However, Hiyori stated that there's no problem with Kiyotaka borrowing the said book since she had a collection of interesting books in the library at her disposal. She boldly declares that she'll read each of them until she graduates.

Kiyotaka was about to leave the scene to execute the purpose he initially had in the library, but Hiyori didn't seem to be satisfied with their small talk after finding someone who seemingly has similar tastes with her when it comes to books. To continue the conversation further, Hiyori asked if Kiyotaka wants to borrow another book, to which he denied. Hiyori then immediately turned her attention to one of the shelves in the mystery section and asked if he had already read ' works. Kiyotaka claimed that he has read 's but not any of Dorothy's. Hiyori recommended the first among ' series by Dorothy — '. She affirmed that once he starts reading the said book, he'll be entranced to keep reading the sequel.

Hiyori noticed that Kiyotaka was not particularly interested in the matter but didn't have the heart to refuse her, so she immediately apologized afterwards for talking incessantly about books. He cleared up her uneasiness by telling her that he was just perplexed for a while but was genuinely interested in borrowing the book she recommended. Hiyori was pleased with his response, thus, inviting Kiyotaka to have lunch together. While the latter didn't expect this development — thinking that the whole thing is a fragment of Kakeru's plan — the former stated she's just a girl who doesn't have friends to talk about novels. Though classes 1-C and 1-D are currently in conflict, since she doesn't have any interest in joining either of the parties involved, she stated that mingling with him will not be a problem.

After mutual consent, both of them went took lunch in the cafeteria. There, Hiyori had a problem in choosing a meal from the menu but in the end, she bought what Kiyotaka had chosen. Kiyotaka offered a helping hand after noticing that Hiyori was having trouble in handling her tray due to her bag. After a few dialogues, the former went to carry the latter's bag and noticed that it was quite heavy — due to the fact that it was filled with mystery-related books. As they sat next to each other, Kiyotaka opened the conversation by asking her whether Hiyori usually had lunch in the cafeteria or not. She denied the question and claimed that she always bought lunch at the convenience store in the morning and ate them in the classroom, so technically, it was a rare event for her. She asked the similar query to him to which he answered that he preferred the taste of food in the cafeteria than in convenience store.

Meanwhile, in Kiyotaka's monologue, he noted that the way Hiyori held the chopsticks was exceptionally charming. After that, Hiyori affirmed that the cafeteria food was delicious and the way Kiyotaka compared the taste of foods sold between the two sources will be kept in mind. The latter then asked whether it was the former's first time to eat at the cafeteria, to which she replied that it was certainly the case. She wanted for so long to have lunch there before but lost the heart to do so given that, to her, it's too far from her classroom. Following the scene where they finished their meals respectively, they talked again about books. While Hiyori was taking out the book from her bag, Kiyotaka immediately acknowledged that her choice of the book was nice. Knowing and confirming that both of them indeed liked the mystery, Hiyori looked elated. Kiyotaka noticed that the book she took out of her bag wasn't from the library. She confirmed that it was from her personal collection of books that she always brought. The lunch break ended with Hiyori allowing Kiyotaka to take the book titled,  and he promised afterwards to return the book to her soon.

Academic Abilities
Not much is known about Hiyori's academic background, but one thing is certain: the scores she got on her assessment by the S-system indicates that she belongs to the upper echelon among her colleagues.

Intellectual Abilities
Hiyori is known to have a sharp intuition which is why she is sometimes tasked with info gathering and surveillance, though she is never serious about it.

When Haruka Hasebe dropped her empty coffee cup on the ground, Hiyori managed to know exactly how much sugar was in it, to begin with, and get a new cup of coffee with the same sugar amount for Haruka later.

Etymology

 * Hiyori's surname Shiina means "oak, mallet" (椎) (shii) and "name" (名) (na).

Trivia

 * The reason for Hiyori's evaluation of Class-C is due to lack of her teamwork skills.
 * Hiyori ranks #30 in "Female Character" category in the 2021 edition of 's  guidebook.
 * For the 2nd Year arc, When asked about her aspirations for the next year, she answered  'To read as many books as I can in the library. And searching for a new book to meet.'