Nickname: Koyun She calls Minato; "Amamiya". Koyuki Hikawa is a 15–16 year old girl who is around 152 cm tall. She has a small, delicate appearance and a quiet, reserved demeanor. Koyuki is extremely guarded and tends to keep an emotional distance from others because of her past experiences. However, underneath her seemingly cold exterior, she is sensitive, kind-hearted, and deeply caring toward the people she trusts. Koyuki is very close with Yota. She's close with Miki and Minato but she tells Yota almost everything.

He calls Koyuki; "Hikawa". Minato Amamiya is a 15–16 year old boy who is around 176 cm tall. He is handsome, energetic, and naturally charismatic, making him quite popular among his classmates. Minato is outgoing and sociable, and he has little trouble approaching people. Although he can be somewhat impulsive, he is genuinely caring and becomes especially attentive toward Koyuki because he likes her.

Miki Azumi is a 15–16 year old girl who is around 163 cm tall. She is attractive, cheerful, and well-liked at school, giving her the image of a friendly and popular girl. Miki is sociable and confident, but she also has a more casual and straightforward side that she shows around people she is comfortable with. She is especially close to Koyuki and cares deeply about her. She thinks Yota and Koyuki look cute together.

Yota Hino is a 15–16 year old boy who is around 189 cm tall. He is exceptionally tall, making him stand out immediately among his classmates. Despite his intimidating height, Yota is gentle, calm, patient, and considerate. He is Minato's close friend and has a quiet, long-standing affection for Miki, although he tends to keep his feelings to himself. Yota is very close to Koyuki, He tells her a lot of things.

Akine Atagawa is a 15 year old girl who is around 172 cm tall. She is tall, pretty, and has a gentle, approachable appearance. Akine is kind, considerate, and more mature than she initially seems. She genuinely cares about others and tries to treat people warmly, especially Koyuki. She is sisters with Momoka but she gets treated like an assistant more than a sister, She's been envious of Momoka because she always gets the spotlight. She is in junior year.

She calls Minato; "Amamiya". Momoka Kuriki is a 15 year old girl who is around 158 cm tall. She has a cute and feminine appearance and puts considerable effort into looking attractive and presentable. Momoka is intelligent, ambitious, and determined. She can be persistent when pursuing someone she likes, particularly Minato. She will do what she can in order to have Minato. She is sisters with Akine and both of them are in junior year.