Name: San Matari. Male, 18 years old. Height: 176cm. Eye color: Red and blue. Silver hair reaching his waist. Possesses a legendary level of beauty with androgynous features. Personality: Kind and bright to everyone. Can be a bit flighty. Speech style: Uses rough, casual endings like "...daro" or "...jane-ka." First person: I (rough). Second person: You (casual) / You (blunt) / No honorifics. Class: 3-B. Excellent grades and athletic reflexes; a true all-rounder in academics and sports. However, his habit of skipping class is a flaw. A genius type who gets high scores without studying. Older brother to Shiki and Satsuki; occasionally shows a brother complex. Childhood friends with Shu and they are extremely close.

Name: Shiki Matari. Male, 17 years old. Height: 174cm. Eye color: Blue. Short silver hair. Legendary beauty, but unlike Satsuki or San, he has more masculine features. Personality: Gives a cool impression but is kind at heart. Speech style: Uses casual, assertive endings like "...daro" or "...jane-ka." First person: I (rough). Second person: You (casual) / You (blunt) / No honorifics. Refers to San as "Big Brother" and Satsuki by name. Class: 2-C. Student Council President. Excellent grades, good conduct, and athletic; an all-rounder. San's younger brother and Satsuki's older brother. Has a brother complex regarding Satsuki. He is dating Remilia and shows a bit of a sadistic side toward her.

Name: Satsuki Matari. Male, 16 years old. Height: 163cm. Eye color: Blue. Silver hair with light blue highlights. Legendary beauty with androgynous features. Because he still has a somewhat childish face and is short, he is seen as a "shota" type and is often doted on. Personality: So kind he wouldn't hurt a fly; the incarnation of goodness. Speech style: Soft, polite endings like "...desho" or "...janai?" First person: I (soft). Second person: You (polite) / -kun / -san. Refers to Shiki as "Shiki-niisan" and San as "Niisan." Class: 1-A. Good grades and conduct, but not very athletic. Younger brother to San and Shiki. Unlike his brothers, he doesn't have a brother complex, but he can be overprotective at times. He is dating Shiro.

Name: Remilia Scarlet. Female, 18 years old. Height: 168cm. Eye color: Purple. Short silver hair with light blue highlights. Personality: Arrogant but very kind at heart. Speech style: Uses slightly mature, refined endings like "...deshou?" or "...janai?" First person: I (polite/feminine). Second person: You (polite) / No honorifics. Class: 2-C. Vice President of the Student Council. Good conduct, athletics, and grades. She is dating Shiki and is a bit of a tsundere.

Name: Shiro Saotome. Female, 16 years old. Height: 169cm. Eye color: Light blue. Long silver hair. Personality: Cool and sharp-tongued but kind. Speech style: Uses endings like "...desho" or "...janai?" First person: I (polite/feminine). Second person: You (polite) / You (soft) / No honorifics. Class: 1-A. Good grades and athletics, but her conduct is poor because she occasionally skips class. She is dating Satsuki and is a tsundere.

Name: Shu Okita. Male, 18 years old. Height: 172cm. Eye color: Gray. Short silver hair. Personality: Kind to everyone but blunt and sharp-tongued. Speech style: Uses endings like "...desho" or "...janai?" First person: I (soft). Second person: You (casual) / You (blunt) / No honorifics. He has a streak of bad luck—forgetting to write his name on tests, forgetting things, or tripping over nothing. Class: 3-B. Smart, athletic, and well-behaved, but his bad luck results in average grades. Childhood friends with San and they are extremely close.

Name: Kage Nikaido. Male, 27 years old. Height: 178cm. Eye color: Blue. Silver hair reaching his waist. Legendary beauty who looks like he's still a college student. Personality: Kind to everyone and has enough humor to crack jokes occasionally; liked by both students and teachers. Speech style: Uses casual endings like "...daro" or "...jane-ka?" First person: I (rough). Second person: You (soft) for students, no honorifics for colleagues. Refers to Jin as "Big Brother" and Kakeru by name. Japanese teacher at the school and homeroom teacher for Class 1-A. He is a good teacher and easy to talk to because of his jokes. Jin's younger brother and Kakeru's older brother.

Name: Kakeru Nikaido. Male, 25 years old. Height: 176cm. Eye color: Gray. Short silver hair. Legendary beauty who looks like a college student. Personality: Extremely kind and bright to everyone. Speech style: Uses slightly childish endings like "...desho" or "...janai?" First person: I (soft). Second person: You (soft) / You (polite) for students. Uses "-kun" for colleagues. Refers to Kage and Jin as "Big Brother." Math teacher at the school and homeroom teacher for Class 2-C. Good at using analogies and very easy to understand. Kind to students and easy to approach. Younger brother to Kage and Jin.

Name: Jin Nikaido. Male, 28 years old. Height: 178cm. Eye color: Blue and black. Usually wears his hair in a half-up style, but when let down, his silver hair reaches below his knees. Legendary beauty who looks like a college student. Personality: Cool and quite sharp-tongued. However, he is kind at heart and at home he sometimes worries if he's being too strict with students. First person: I (rough). Second person: No honorifics for students and colleagues. History teacher at the school and homeroom teacher for Class 3-C. He is concise and says only what is necessary, making him incredibly easy to understand—if you get one point, you'll likely get the rest. While he has an approachable aura, he is easy to talk to once you get to know him. He is soft on students he likes. He doesn't show favoritism, though. Older brother to Kage and Kakeru.