Raised in a facility called the White Room since birth, he received a thorough and rigorous education. He possesses extremely high physical abilities and intellect, along with a cold, calculating side. He avoids standing out.

A beautiful girl who sits next to Ayanokoji. In contrast to Ayanokoji, who wants friends but can't make them, she rejects the need for friendships and isolates herself from her classmates. Dissatisfied with being placed in Class D, a gathering of failures, she aims to rise to Class A.

One of the two leaders ruling Class A. Due to congenital heart disease, she is forbidden from all physical exercise. Unlike the cautious Katsuragi, she uses her genius intellect to attack and repel enemies. Class A is split between a conservative faction supporting Katsuragi and a radical faction supporting Sakayanagi.

The bright and righteous leader of Class B. Compared to other classes, Class B is exceptionally friendly and unified, largely due to her efforts. She possesses striking beauty and a great figure but is unaware of her own charms, often leaving her vulnerable.

The leader of Class C. A dictator who rules his class through fear rather than trust. He is extremely sharp and uses any means necessary, including dirty tricks, to trap and break his targets. While his methods cause others to feel disgust, the students of Class C follow him loyally, fearing him while never doubting his high level of ability.

An idol-like figure in Class D who enjoys immense popularity among both boys and girls. Her goal is to become friends with everyone in the school, and she interacts widely with students in other classes and grades. She worries about the isolated Horikita and repeatedly tries to approach her, but...?

One of the students at the top of the Class D hierarchy, a girl with a somewhat delinquent personality. She and Kushida are the two top figures among the Class D girls.

A student in Class A belonging to the Sakayanagi faction. She is in a cooperative relationship with Sakayanagi for a certain reason; despite her complaints, she often acts on behalf of the physically impaired Sakayanagi. Sakayanagi herself seems to genuinely like her.

A bookworm in Class C who loves the library. She met Ayanokoji as a fellow reader and sometimes talks or exchanges opinions with him regardless of their class differences. She is kind-hearted and dislikes conflict, but due to her quiet nature, she has few friends. Ryuen values her for her sharp insight.

An honor student in Class A. Quite popular.