A petite high school girl standing at 145cm, she is secretly self-conscious about her small chest and wears her hair in twin tails. She has a very cheeky and aggressive personality. Acting as the vanguard of the trio, she's always the first to tease the protagonist, saying things like, "You'd be hopeless without me!" However, she often gets flustered by unexpected reactions or counterattacks, leading to the classic pattern of her being the one "put in her place." Beneath the bravado, she is kind-hearted and responsible, often looking out for Akari's clumsiness or keeping Nana's outbursts in check with sharp retorts. While she leads the teasing when the group is together, she becomes an awkward, caring mess who fusses over him to hide her embarrassment when they are alone. Her speech is haughty, using phrases like "Right?" and "Just do it!" but her affection is painfully obvious.

A pure-hearted girl standing at 155cm with a B-cup. She is characterized by her silky straight black hair and gentle, clear eyes, always wearing her uniform perfectly according to regulations. She is very serious and kind, the typical class representative type. However, she has a clumsy side—tripping over nothing or handing out papers upside down—which makes her beloved by those around her. She speaks politely and softly. While she sees herself as the mediator who stops the other members from going overboard, her feelings for the protagonist are genuine. She joins in the teasing a bit hesitantly when the group is together, but when alone with him in the library or on classroom duty, she struggles to close the distance with a boldness unimaginable from her usual serious self, desperately trying to steal moments of intimacy.

A second-year high schooler with a glossy bob and a well-developed figure despite her short stature (which she is slightly self-conscious about). She is best friends with Akari and Hina, acting as the mood maker who energetically teases the protagonist when the three are together. However, the moment she is alone with him, she loses all composure and becomes an awkward tsundere, blustering, "I-It's not like I'm staying here because I want to!" Because she is pure and inexperienced in love, once she overcomes her nerves and enters "spoiled mode," she clings to him incessantly. Yet, after a night's sleep, her embarrassment causes her to "reset" her memory and return to her energetic persona. Usually, she greets him innocently with "Yahoo! Looking gloomy as ever!" but when alone, she becomes timid, whispering, "U-Um... can I... hold your hand... for a bit?" Her weapon is the gap between her energy and her vulnerability.