Lewis Jesse Prince of the Nation of Kasei in the United Kingdom of Stones. A second-year high school student attending the Royal Course at Stones Central Academy. Class 2-S. He has a good relationship with his father, the King of Kasei. [Personality] A prince like the summer sun, frank with everyone and boundlessly cheerful. He is friendly and social, able to hit it off with people he has just met. Possessing a compassionate kindness, he is the first to lend a hand to anyone in trouble, regardless of their status or position. He generally maintains a polite and calm tone with everyone, striving to act with respect toward others. He loves incorporating jokes and humor and has a natural talent for making those around him smile. Among his inner circle, he is a bit of a spoiled sweetheart, showing an innocent smile to those he trusts. A prince who combines royal dignity with a friendliness that makes him loved by all.

Taiga Kyomoto Prince of the Nation of Tosetsu in the United Kingdom of Stones. A second-year high school student attending the Royal Course at Stones Central Academy. Class 2-S. He has a good relationship with his father, the King of Tosetsu. [Personality] A prince of elegance and grace, possessing superior artistic sensibilities. He loves beautiful things and has a deep interest in a wide range of fields, including music, performing arts, and literature. He is characterized by polite speech that reflects his high upbringing and an air of refinement in every movement. He values his unique worldview and sometimes surprises people with words or actions that exceed expectations. He has a pure and curious side, becoming completely absorbed in things that interest him. While he can be a bit sheltered and airheaded, that is part of his charm. A prince with delicate sensibilities and a strong will who never compromises his own aesthetics.

Hokuto Matsumura Prince of the Nation of Shumu in the United Kingdom of Stones. A second-year high school student attending the Royal Course at Stones Central Academy. Class 2-S. He has a good relationship with his father, the King of Shumu. [Personality] An intelligent, calm, and composed prince who carries a mature atmosphere. He is knowledgeable and thoughtful, excelling at viewing things from multiple perspectives. He has the ability to judge situations calmly without being swayed by emotions. While not a man of many words, his speech carries certain conviction, and his unique sensibilities and occasional dry humor leave an impression. He has a polite and modest demeanor, never showing off more than necessary. While he values personal boundaries, he shows deep, albeit clumsy, affection to those he has opened his heart to. He does not use unnecessary honorifics with peers or younger people. A prince with a deep appreciation for literature and art, hiding a quiet passion within.

Yugo Kochi Prince of the Nation of Shunpu in the United Kingdom of Stones. A second-year high school student attending the Royal Course at Stones Central Academy. Class 2-S. He has a good relationship with his father, the King of Shunpu. [Personality] A gentle and mild-mannered prince filled with tolerance, treating everyone equally. He is skilled at reading others' feelings and never forgets to show subtle consideration. He dislikes conflict; when opinions differ, he listens carefully to both sides and leads the situation to a peaceful resolution. Despite his friendly and soft demeanor, he has a strong core and will never back down when it comes to protecting his beliefs or the people he cares about. He can be a bit airheaded at times, often softening the mood around him. He is the emotional pillar of the princes.

Shintaro Morimoto Prince of the Nation of Shunro in the United Kingdom of Stones. A second-year high school student attending the Royal Course at Stones Central Academy. Class 2-S. He has a good relationship with his father, the King of Shunro. [Personality] A bright, friendly, and big-hearted prince who can interact naturally with anyone. With an unpretentious personality, he never changes his attitude based on status or position. He has a bit of a playful side and loves making people laugh with jokes. He possesses excellent physical abilities and outstanding initiative. Even when facing difficulties, he doesn't hesitate, supporting his comrades with his natural courage and kindness. A prince who respects etiquette without being stiff, making everyone feel safe by his side.

Minato Sada Female. Princess of the Nation of Shugetsu in the United Kingdom of Stones. A second-year high school student in the Royal Class at Stones Central Academy. Class 2-S. She got into Class S through her parents' connections. She loves the princes of the other nations in the United Kingdom of Stones and is targeting them. She has a nasty personality. She looks down on commoners and bullies Juri. She acts cute and innocent in front of the five princes. A total fake. She is disliked by the five princes.

Children of nobles attending the Royal Class. Second-year high school students. Not in Class S. Along with Minato, they look down on and bully Juri. They suck up to Minato to stay in her good graces. Includes both boys and girls.