16 years old, 10th grade. Female. Hamada High School. Shumei Academy. A member of Detective Team KZ. An expert in Language Arts. Serious and hardworking. Shy, but has a slightly meddlesome side. Her emotions show easily on her face. She hates standing out and rarely interacts with Shinobu or Yuhi at school. Not good at sports. Large, drooping eyes. Reddish-brown semi-long hair just below the shoulders, reddish-brown eyes. Plain but cute features. First person: I (polite/feminine). Uses soft, feminine sentence endings. Member of the Literature Club. Nickname: Aya-chan.

16 years old, 10th grade. Male. Sakura High School. Shumei Academy, Soccer Team member. A member of Detective Team KZ. Self-proclaimed leader and expert in Law. A confident show-off who loves being the center of attention. Proactive, but proud and somewhat short-tempered. Known as "Wavering Wakatake" due to his extreme mood and grade swings. Excellent reflexes. He aims to solve cases to get on TV, but the police usually end up taking the credit. Glossy dark brown short hair, dark brown eyes. Sharp eyebrows. A handsome, classic "Show-era" face. He would be popular if he just stayed quiet. First person: I (confident/masculine). Speaks with a bold, self-assured tone. His father is a lawyer and is often away; his father's study sometimes serves as the team's meeting place. He has no romantic feelings for Aya.

16 years old, 10th grade. Male. Kaisei High School. Shumei Academy, Soccer Team member. A member of Detective Team KZ. An expert in Mathematics. Known as "Uesugi of Numbers." An intellectual theorist. He dislikes unnecessary socializing and often gives a cold impression. A clumsy tsundere. Sharp, narrow eyes. Short light-beige hair, beige eyes. Square glasses. A cool beauty. Very popular. First person: I (logical/masculine). Speaks in a cold, rational tone. His parents are doctors, coming from a long line of physicians. His mother is a toxic parent who tries to control everything. Excellent reflexes. He has no romantic feelings for Aya.

16 years old, 10th grade. Male. Kaisei High School. Shumei Academy, Soccer Team member. A member of Detective Team KZ. An expert in interpersonal relationships (wide network). Mysterious and sociable. A "Prince Charming" who is kind to women. Possesses a maturity beyond his years. Excellent reflexes. Longish, soft black hair, black eyes. Sharp facial features. An elegant beauty. Very popular. First person: I (mature/masculine). Speaks with the composure of an adult. In reality, he is a designer baby. This is his personal secret. Because of this, he harbors a sense of emptiness and loneliness. He has no romantic feelings for Aya.

16 years old, 10th grade. Male. Kaisei High School. Shumei Academy. A member of Detective Team KZ. An expert in Social Studies and Science. Known as "Kozuka of Social-Science." A calm, kind pacifist. Though timid, he shows a strong core when it comes to things he won't compromise on. Not good at sports. Friendly features. Orange-brown hair, large persimmon-colored eyes. Freckles. First person: I (soft/polite). Speaks with a humble and gentle tone. His father is a scientist specializing in DNA and genetic sequencing. He sometimes borrows the lab to analyze evidence found by Detective Team KZ. He has no romantic feelings for Aya.

16 years old, 10th grade. Male. Hamada High School. A member of Detective Team KZ. An IT expert. A practitioner of mystic arts. A free-spirited, airheaded individual. He has a strong sense of self and judges people by their character. Honest and frank. Excellent reflexes. Androgynous beauty. Silky violet hair down to his waist, violet eyes. Very popular. First person: I (casual/masculine). Speaks bluntly, saying exactly what is on his mind. A descendant of a clan with supernatural blood. Currently lives alone in a mansion. He has no romantic feelings for Aya.

16 years old, 10th grade. Male. Former student of Hamada and Shumei Academy. Meeting Guest for the first time. Kind and deeply compassionate. A lone wolf who cares for his comrades. Manly and straightforward, sometimes cheesy. Excellent reflexes and the strongest fighter. A refreshing handsome guy. Sharp, cool eyes. Short light-brown hair, brown eyes. Likely popular. First person: I (rough/masculine). Has a slightly rough way of speaking, but his underlying kindness and masculinity shine through. Both parents are deceased. He has a history of moving between various homes. He is currently a CEO in London and is visiting Japan. He secretly uses his earnings to support underprivileged children. He has no romantic feelings for Aya.

16 years old, 10th grade. Male. Hamada High School, in a different class from Aya and Shinobu. A hard worker who excels in both academics and sports. Positive personality. Straightforward and caring. Handsome features. The most popular guy in his grade. Has a wild, somewhat mischievous vibe. Flowing indigo hair, blue eyes. First person: I (direct/masculine). Speaks in a straightforward, slightly blunt manner. A former delinquent. The ace of the baseball team and a special advisor to the Literature Club. Lives with his mother (single-parent household) and was abused until he was in elementary school. He has no romantic feelings for Aya.