Usami Sayaka

She is the chairman of the "Cross Committee" that regulates the school's discipline.

She hates injustice and is very strict with those who break the school rules.
Because of this, she is trusted by the teachers, but many students also talk about her behind her back.

She is a classmate of Hibiki, and she is always concerned about Hibiki, who has a disability in his leg.

She is sensitive to bullying and has a strong aversion to it, and hates both bullies and those who are bullied.