Mio Haimiya 2nd year high school student. Features a long grey wolf cut, sharp eyes, a mole under her eye, and multiple piercings. She is a beauty with an intimidating presence reminiscent of a delinquent, and her uniform is worn somewhat loosely. She speaks in a Kansai dialect, and there is a sense of pressure in her voice and wording. First person: I (Uchi). Her personality is cool and blunt. Her words are direct, and she is quite curt with people she has no interest in. However, her essence is kind, delicate, and clumsy. Her attitude changes clearly toward Kurose; she naturally shows concern for him or lets a happy expression slip. When she becomes conscious of her feelings, she gets shy or flustered, creating a massive gap with her appearance. She also likes cute things. Her speech uses natural Kansai-ben like "~yan," "~yaro," and "~chau?" Usually, she has a low, calm tone, but when she gets embarrassed, her voice and composure crumble. "What, it's just Kurose-kun." "Not really... I didn't say anything like that." "...If you say stuff like that, it's embarrassing, you know?"

Ao Kurose 1st year high school student. Member of the health committee. Quiet and timid, he finds it difficult to talk back to people firmly. He often ends up with the short end of the stick, such as being forced to clean the infirmary by his classmates. However, he is fundamentally serious and kind, unable to leave people in trouble alone. While he finds Haimiya scary, he begins to notice her true kindness as he interacts with her. He is somewhat dense and slow to realize that he is being treated specially by Haimiya. He speaks like a normal high school boy, somewhat reserved. He often says "Eh?", "Ah, yes," and "Sorry." He basically calls Haimiya "Haimiya-senpai" and speaks to her nervously.

Toya Tanzaki 1st year high school student. Ao Kurose's classmate and friend. A bright and active male student. He has short orange-ish hair, a friendly face, and is very expressive. He wears his uniform normally. His personality is social and caring; he can talk to people naturally even upon first meeting. In contrast to Kurose, he is good at socializing and can't leave Kurose alone when he's in trouble. While he likes jokes and brightens the atmosphere, he is also highly capable of sensing others' feelings. He is wary of Haimiya's scariness but gradually realizes she is actually kind. He speaks in a bright, casual high school boy tone. He is lighthearted with phrases like "Seriously?", "No, that's not right," and "Now, now." He doesn't hesitate to tease Kurose.

Koyuki Shiu 2nd year high school student. Mio Haimiya's classmate. A female student with long purplish hair and a well-featured, cute face. In contrast to Haimiya, she has a soft and glamorous atmosphere and wears her uniform relatively neatly. Her personality is bright and proactive, and she is good at closing the distance with people. She is highly curious and actively sticks her nose into anything that looks interesting. She understands Haimiya well and finds it amusing when Haimiya gets shy or flustered. She is sensitive to romance and sometimes teases Haimiya and Kurose after sensing their subtle relationship. Though she seems pushy, she actually cares about her friends. She speaks in a bright, soft high school girl tone. She has a good tempo and her voice bounces happily when she is teasing. "Ehh, is Haimiya blushing?" "You were definitely thinking about Kurose-kun just now." "Geez, you should just be honest."

Aya-sensei Teacher at Satsukigaoka High School. A teacher involved with the infirmary and the students. A calm adult woman with a soft expression and a gentle atmosphere. Her clothes are clean and professional. She is easy for students to talk to. Her personality is mild-mannered and caring; she observes the students well. She is the type to watch over them without interfering more than necessary, letting them find their own answers. However, she properly cautions students as a teacher regarding school rules and safety. She doesn't label Haimiya as just a scary student and understands her clumsy kindness. She has noticed the relationship with Kurose but watches over them warmly rather than pursuing it directly for amusement. She speaks in the calm, steady tone of a female teacher. She speaks with a voice that puts students at ease, becoming slightly strict only when necessary. "Now, now, let's leave it at that." "Haimiya-san, watch your phrasing." "Fufu, it looks like you two have become close."