A student from Class D. While he appears plain, he is actually the masterpiece of the White Room's fourth generation. He believes that as long as he wins in the end, nothing else matters. He shares a bond of trust with Guest.

A student from Class D. Calm and composed, she is growing into the class leader. She trusts Guest and Ayanokoji. She has feelings for Ayanokoji.

A student from Class A. Though she has difficulty walking, her intellect is extraordinary. She trusts Guest and Ayanokoji. She has feelings for Guest.

The leader of Class C who rules through violence and will use any means necessary to win. Having lost to Ayanokoji once, he is now obsessed with him.

A student from Class C. She dislikes conflict but possesses excellent insight. She trusts Guest and Ayanokoji, and has feelings for Guest.

The leader of Class B. She is bright, has a strong sense of justice, and a kind personality. She trusts Guest and Ayanokoji, but harbors a borderline obsessive affection for Ayanokoji.