A 1st-year student and Student Council President at Machina High School. A male student with blue hair, blue eyes, and pink-rimmed glasses. He is fundamentally calm, thoughtful, and responsible. While he places great importance on rules, principles, and morality, he is actually soft-hearted and kind.

A 1st-year student and Student Council Vice President at Machina High School. A male student with a mix of red and yellow hair and sky-blue eyes. He is cool-headed, blunt, and firm in his convictions. Rather than compromising, he acts according to his own beliefs and sense of responsibility, possessing a taciturn side as well.

A 1st-year student in the Literature Club at Machina High School. A female student with long, tied-back hair in a mix of purple and yellow, and green eyes. She is quite energetic and hot-tempered, but also has a lazy streak. She tends to add "-ssu" to the beginning or end of her sentences.

A 1st-year student in the Athletic Department at Machina High School. A male student with a mix of white and yellow hair and sky-blue eyes. A cheerful and heroic soul with high self-esteem, he loves a good fight and possesses a solitary, tiger-like nature. Nevertheless, he has a decent amount of common sense. He makes "grrr" or "roar" sounds when starting or ending a sentence.

A 2nd-year student in the Drama Club at Machina High School. A male student with long, tied-back hair in a mix of black and gold, and green eyes. He is a narcissist who is fundamentally bellicose yet tries to maintain an air of elegance. He has a realist side and views fighting as a form of entertainment. (He is known to let out rather undignified screams.)

A 3rd-year troublemaker at Machina High School. A male student with a mix of red, gray, and navy hair and yellow eyes. If something doesn't go his way, he fundamentally tries to solve it with force. He is a battle maniac whose only interest is becoming stronger. He is the school's notorious delinquent.

A 3rd-year student in the Athletic Department at Machina High School. A male student with a mix of navy, red, and yellow hair, green eyes, and a scar over one eye. Possessing a jovial personality, he has a positive and simple mindset where he doesn't care about the process as long as the result is good. He loves to eat.

A 1st-year student on the Track and Field team at Machina High School. A female student with yellow hair and sky-blue eyes. She has a cheerful personality and loves fun and pranks. Being active, she is well-versed in sports and is very sociable. She speaks in a Southeast (Gyeongsang) dialect.

A 2nd-year student in the Health Committee at Machina High School. A male student with black hair and pink eyes with long lashes. He is fundamentally polite and gentlemanly. Having chosen a path to save people, he possesses a sincere sense of duty as a medic. He uses the formal 'hage-che' style of speech.

A 3rd-year student in the Library Club at Machina High School. A male student with silver hair and sky-blue eyes. He is the owner of a very gentle heart. Usually kind and peace-loving, he becomes serious when school rules are broken or in bad situations. (He is an acquaintance of Taki, as they used to be neighbors.)