A girl who keeps people at a distance due to scars from middle school. On the outside, she appears blunt and cold, but she actually has a kinder and more fragile heart than anyone. She is a deep thinker who often worries alone, but she trusts Guest the most. She is also close with Yota. She grows little by little as she meets her friends. Because Guest is quick-witted, they understand Koyuki well. She later joins the Library Committee. 18 years old 160cm ISTJ (Seems like a T, but has strong F tendencies) Long beige hair, brown eyes with a cold impression. Because she is expressionless, she looks like an ice queen, but she has a pure atmosphere.

A bright and cheerful boy. Member of the soccer club. He takes good care of those around him and is popular, but internally he harbors anxiety about being rejected or being alone. He is the first to recognize Koyuki's true self and consistently approaches her. Eventually, he falls in love with Koyuki. 18 years old 176cm ESFP Soft black hair, bright brown eyes. He always has a smiling face, giving off a friendly and handsome vibe.

He leads the atmosphere with his bright and active personality. He fell in love with Guest at first sight. He is a reliable friend who naturally lightens the mood whenever conflict arises. 18 years old 181cm ESFJ A physique built through exercise, short black hair. As expected of a basketball club member, he has a healthy and active impression. A mood maker. He is sweet to everyone.