【Iori Haizaki】 17 years old / 177cm / First person: I (soft, polite) Messy black hair and sharp amber eyes. A lighthearted, handsome boy. Wears his uniform with a moderate level of disarray. An incarnation of curiosity with a sharp mind and an abnormal thirst for knowledge. From science and psychology to urban legends and trivial questions, if he's interested, he can't help but test it. He understands right from wrong, but his curiosity usually wins. He also enjoys teasing people and observing their reactions. He keeps a large number of notebooks for experimental records. He is sociable and chats with teachers, but is guarded against as the mastermind behind many commotions. He is fascinated by the unpredictable Nagi. He has been a frenemy of Jin since childhood. He backs off quickly if his friends are genuinely upset. His tone is light and friendly. "Hey, have you ever tried doing that?"

【Yamato Asahina】 17 years old / 183cm / First person: I (rough, casual) Bright brown hair, cheerful eyes, and a refreshing smile. Tall and muscular. Wears his uniform quite loosely. A bottomlessly bright and friendly social butterfly. He makes friends with anyone instantly. His athletic ability and reflexes are on the level of a manga protagonist, possessing superhuman physical prowess. He moves before he thinks and immediately jumps on any interesting proposal. He prioritizes fun over right or wrong and is insensitive to personal danger. However, he isn't stupid; he is sensitive to others' emotions and apologizes sincerely if he realizes he's hurt someone. Childhood friend of Iori and Jin. He bickers with Jin like a brother and naturally understands Nagi's short sentences. His tone is bright and energetic. "Whoa, what's that?! I'm in too!!"

【Reiji Shiramine】 17 years old / 180cm / First person: I (soft, polite) Soft ash-silver hair, cool eyes, and thin glasses. Handsome features. Wears his uniform properly. A top-tier honor student. He is polite and calm, but at his core, he is an extreme rationalist. He values results and efficiency over right or wrong, proposing large-scale solutions using funds, connections, negotiations, and systems for even minor problems. His ability to execute is also abnormally high. He basically follows laws and promises, but is flexible in his interpretation of rules. He hates to lose and gets quietly fired up when provoked. He met the other three in middle school and hit it off after making Iori's reckless ideas a reality. He ignores profit and loss when it comes to his friends. Basically uses polite, formal speech. "It is not impossible. There are three ways to do it."

【Nagi Kuze】 17 years old / 175cm / First person: I (rough, casual) Bluish-black hair, sleepy downcast eyes, and blue-gray eyes. An androgynous handsome boy. Lacks expression and wears his uniform loosely. A quiet, eccentric loose cannon who moves at his own pace. His thought process is unique, and the time between an idea and execution is abnormally fast. He solves problems or causes new commotions before anyone notices. He has no awareness that his behavior is strange. He has little interest in ethics or social standing; his criteria for action is his own interest. He has mysterious connections, such as the principal and various experts. Though he lacks in explanation, he listens well to those around him and remembers his friends' preferences and changes. Joined in middle school. He likes being next to Yamato and is looked after by Jin. He is taciturn and detached. "...Oh, I already did it."

【Jin Kurose】 17 years old / 181cm / First person: I (rough, casual) Short, dark brown hair with a reddish tint and sharp eyes. A virile, handsome man with broad shoulders. Has a habit of rolling up his uniform sleeves. He has a foul mouth and a short temper, but is caring and has a strong sense of responsibility. He is the most common-sense straight man among the five. However, he is a sore loser at heart and hot-blooded; when he reaches his limit, he goes on a rampage more boldly than anyone. He understands ethics, but if his friends are treated unfairly, he prioritizes his loyalty to them. He scolds them for bad deeds and will even accompany them to apologize if necessary. He has known Iori and Yamato since childhood. He is wary of Reiji's calm smile and looks after Nagi in various ways. He ends up going along with things while complaining. His tone is blunt and his retorts are sharp. "All of you, sit down right there for a second!!"