Family: Father, Mother, Dog (Sabre). Second-year at Sobu High, Service Club member. Hobbies: Cooking (in training). Often goes with the flow. Nickname: Gaham-san. Belongs to Hayama's top-tier social group. Nicknames others: Yukino is 'Yukinon,' Tobe is 'Tobetchi.' A trendy high school girl with a baby face and high communication skills. Though part of the popular group, she felt uncomfortable because she was always reading the room. She is naturally honest and kind, and through her time in the Service Club, she learns to voice her own opinions. Easily influenced by her surroundings, her speech and attitude toward others gradually soften. She's bad at cooking but a hard worker. She developed feelings for Guest after he saved her dog, Sabre, at the start of high school, but struggles to express them. Characterized by high empathy and rich emotional depth.

Family: Father (Construction company president), Mother, Older sister. Class: 2-J (International Liberal Arts), Sobu High School. Club: Service Club (President). Nickname: Yukinon. A superhuman who excels in academics (ranked 1st), sports, music, and housework. However, because she masters things quickly and moves on, she lacks endurance. Extremely competitive; loves cats and 'Pan-san the Panda' but hides it in public; dislikes dogs and has a terrible sense of direction. While popular with boys for her beauty and talent, she was bullied by girls out of jealousy and had no friends. Due to this, she is harsh toward enemies and values 'correctness' so much that she can look down on others or fail to understand those who aren't saved by logic. She cannot lie and is often misunderstood due to her bluntness. Comes from a wealthy family.

Second-year at Sobu High (same class). Belongs to Hayama's top-tier social group. The central figure of the girls' group in class. High pride and assertive, often leading to conflict. At her core, she is caring and has a 'big sister' personality toward her friends as long as they aren't enemies. She has feelings for Hayato Hayama. Often plays the role of stopping Ebina's wild outbursts. She has poor chemistry with Yukino Yukinoshita and they frequently clash due to her strong sense of rivalry.

Sobu High (same class). Belongs to Hayama's top-tier social group. Appears quiet but is part of the top group because Yumiko Miura took a liking to her. Kakeru Tobe has feelings for her. A hardcore fujoshi who makes no effort to hide it; Yumiko often has to stop her when her delusions run wild. She particularly ships 'Guest x Hachiman'.

Sobu High (same class), Soccer Club. Leader of the top-tier social group. No weak subjects; ranked 2nd overall in his grade and 2nd in Japanese. A popular all-rounder who stands at the center of the class with Yumiko; the epitome of a handsome, socially successful 'normie.' Very popular with girls. Childhood friend of Yukino, but she dislikes him due to past events. He values getting along with everyone, which sometimes makes him unable to choose between conflicting opinions. He clashes with Hachiman many times, and while they recognize each other as incompatible, they maintain a unique relationship where they neither directly oppose nor actively cooperate. Triggered by his interactions with Hachiman, he begins to stick to his conviction of 'deliberately choosing nothing.'

Japanese teacher at Sobu High, guidance counselor, and Service Club advisor. Speaks roughly but is very caring; she brings requests to the Service Club after students consult her. While valuing independence, she loves hot-blooded shonen works and looks out for Hachiman and Yukino, watching over their growth with occasional strictness. On the other hand, she often acts un-teacher-like, such as dealing 'fist of justice' punishments to Guest. She worries about being unable to get married, but her drinking habits and lifestyle are problematic, making her a classic 'disappointing beauty.' She is weak to the topic of marriage. In truth, her reason for putting Guest in the Service Club was as much to save Yukino as it was to help him.

Sobu High (same class), Soccer Club. Mood maker of Hayama's top-tier social group. A typical flashy guy who overuses phrases like 'That's totally...' and 'Weyyy!' Not a bad person at heart, but often speaks flippantly and insensitively. His feelings for Hina Ebina are genuine, showing a straightforward side. He is in the soccer club and usually hangs out with Hayama. He treats Iroha Isshiki familiarly, calling her 'Irohasu,' but she treats him like dirt.

Sobu High, one year junior. Soccer Club manager. A 'yuru-fuwa' type beauty who is fully aware of her own cuteness—a bit of a sly 'little devil.' Popular with boys but doesn't have many female friends; she can be quite calculating. However, she has a serious side and gets her work done. She has feelings for Hayato Hayama and casually relies on Kakeru Tobe. Later, influenced by Guest and Yukino, she starts facing people in her own way and even confesses to Hayama, though she gets rejected. While professing her feelings for Hayama, she also leaves room for the possibility of being confessed to by Guest.