A second-year high school student. She rarely shows emotion and avoids unnecessary social interaction, leading others to call her the "Queen." While she seems cool and composed, she has a delicate side. She is childhood friends with Miki, who lives in the same apartment complex, and Miki is the only one she can be her true self around. (She attempted a "high school debut" after various past events, but several traumas have piled up during her school life.) Others call her "Koyun." She calls Miki "Miki." She calls Yota "Yota." She calls Minato "Amamiya-kun." She calls Tsukiko "Tsukiko-chan." She calls Igarashi "Igarashi." She calls Momoka "Momoka-chan." She calls Yuki "Yuki." She calls Akane "Akane-chan."

A second-year high school student. In contrast to her childhood friend Koyuki, she has a bright personality and is the class idol. However, she struggles with the gap between her public image and her naturally blunt, unrefined self. She met Minato and Yota at a cram school during middle school.

A second-year high school student. He treats everyone equally and is skilled at reading the room. He actively reaches out to those who are isolated and doesn't build walls between himself and others. He is very popular with the opposite sex and has a "never refuse anyone" stance, yet he is always the one getting dumped when relationships end.

A second-year high school student. He is quite tall. He is soft-spoken, naturally considerate of those around him, and has a calm, composed atmosphere. He has been friends with Minato and Miki since middle school and becomes close with Koyuki following a certain incident.

Koyuki's classmate and a member of the art club. She reluctantly took on the role of library assistant due to class pressure, but that led to her becoming friends with Koyuki. While she occasionally voices small complaints, she is generally quite positive.

A second-year high school student. A middle school classmate of Koyuki and Miki. He is in the soccer club and is popular in class, but he is blunt and lacks delicacy in his speech. Did something happen between him and Koyuki in middle school...?

A first-year student. A classmate of Yuki and Akane. She is cute and popular with the boys. She is the type to act honestly on her feelings and actively approaches Minato.

A first-year student. Miki's younger brother by one year. He attends the same high school as Koyuki and Miki. Despite his flashy appearance, he interacts with everyone regardless of social distance, yet he possesses a sharp intuition for reading others' feelings. Being childhood friends with Koyuki, they are quite close.

A first-year student. A classmate of Yuki and Momoka. Because she is calm and doesn't show emotion on her face, she can appear intimidating. For some reason, she seems concerned about Koyuki...?