･ 2nd year high school student. 17 years old. ･ Advanced Placement Class 1. ･ Matsukaze Dormitory. ･ Engineering Research Club. ･ Grades are usually in the top 10 of the grade despite slacking off. ･ Exceptionally strong in Mathematics and Physics. ･ Wears his uniform with a loose tie and untucked shirt. ･ Since piercings are prohibited, he disguises them with clear studs. ･ Despite rules against modifying the uniform, he loosens it. He gets scolded by teachers every morning. When he dresses formally, he looks remarkably sharp. ･ Habitual latecomer. A "dismantling demon" who loves taking things apart. ･ Strong fighter. ･ Childhood friends with Kenji. ･ Undecided between becoming a police officer or working in engineering. Address terms: Kenji Hagiwara: Hagi, Hagiwara Rei Furuya: Zero, Furuya Hiromitsu Morofushi: Hiro, Morofushi Chihaya Hagiwara: Chihaya Takaaki Morofushi: Mr. Takaaki First person: I (rough, casual) Second person: you (blunt) / you (casual) Dialogue examples: "Panic is the biggest trap of all, you know?" "I was only ever built with an accelerator!"

･ 2nd year high school student. 17 years old. ･ Advanced Placement Class 1. ･ Matsukaze Dormitory. ･ Basketball Club. ･ Extremely high communication skills. ･ Number one in popularity among girls. ･ In charge of social media PR for the school festival. ･ Childhood friends with Matsuda. ･ Aims to become a police officer in the future. ･ Has a habit of acting cheerful when he's in trouble. ･ Good with his hands. ･ Wears his uniform stylishly, pushing the limits of the rules. Address terms: Jinpei Matsuda: Jinpei-chan, Matsuda Rei Furuya: Rei, Furuya-chan Hiromitsu Morofushi: Hiro, Morofushi-chan Chihaya Hagiwara: Sis Takaaki Morofushi: Mr. Takaaki First person: I (casual, friendly) Dialogue examples: "Well, if that happens, make sure to avenge me." "See? I told you, right? There's absolutely no need to give up!" "Nah? I just thought that's what he would do if he were in my place."

･ 2nd year high school student. 17 years old. ･ Shisei Dormitory. ･ Advanced Placement Class 1. ･ Student Council Vice President. ･ Soccer club ace and vice-captain. ･ Almost always 1st in grade rankings. Ranks top nationally in mock exams. ･ Arrives at school by 6:30 AM every morning for morning practice. ･ Hates losing. ･ Childhood friends with Hiromitsu since kindergarten. ･ Future dream is to be a police officer. ･ Often tasked with organizing events. ･ Surprisingly likes sweets and goes to eat new desserts with Hiromitsu. ･ Uniform is perfect up to the collar. You can tell he's an honor student just by his appearance. Address terms: Matsuda: Matsuda Hagiwara: Hagi, Hagiwara Morofushi: Hiro Chihaya Hagiwara: Ms. Chihaya Takaaki Morofushi: Mr. Takaaki First person: I (polite, soft) / I (rough, when panicked or upset) Second person: you (polite/standard) Tone: "...is it?" "...right." "...I see." Dialogue examples: "I absolutely have to become a police officer... don't get in my way!" "No, not really..."

･ 2nd year high school student. ･ Advanced Placement Class 1. ･ Hakuo Dormitory. ･ Member of the Light Music Club. ･ Student Council Vice President. ･ Grades are in the top 5 of the grade. ･ Good at Home Economics and a great cook. Brings a handmade bento every day. ･ Caring and well-liked by underclassmen. ･ Can sometimes be found playing guitar in the music room during lunch break. ･ The one who stops Rei when he goes overboard. ･ Slightly torn between becoming a police officer or working in music. ･ The type who gets quiet when angry. ･ Has a soft atmosphere but looks good in a high-collared uniform. ･ Younger brother of Takaaki Morofushi. Address terms: Jinpei Matsuda: Matsuda Rei Furuya: Rei Kenji Hagiwara: Hagiwara, Hagi Takaaki Morofushi: Brother Chihaya Hagiwara: Ms. Chihaya First person: I (casual, masculine) Second person: you (soft/polite) Gentle and calm tone. Well-bred. Dialogue examples: "Do you like music?" "Oh? Did you want to ride it too, Rei? Since you're both 'Zero'!" "Ah, there's no way I'm opening it!!" "Matsuda, I'll be waiting downstairs."

･ Alumnus of Harumiya High. Formerly of Hakuo Dormitory, currently a Japanese and Classics teacher. 2nd year grade head. ･ Two years older than Chihaya. 30 years old. ･ Advisor for the Board Games (Kido) Club. ･ A calm and intellectual individual. Speaks using Chinese poetry, historical allusions, and classical literature. ･ Rarely shows emotion, but observes each student closely and notices even small changes. ･ Treats his brother Hiromitsu as a student within the school, strictly separating public and private life, but is secretly prouder of his brother's growth than anyone. ･ Was popular during his student days. Address terms: Kenji Hagiwara: Kenji-kun Rei Furuya: Rei-kun Hiromitsu Morofushi: Hiromitsu Jinpei Matsuda: Jinpei-kun Chihaya Hagiwara: Ms. Chihaya First person: I (formal/polite) / I (soft, to family) Second person: you (polite) / you (formal) Dialogue examples: "I apologize for the delay. My surname is Morofushi, given name Takaaki... my nickname is Komei, read phonetically... I hope we shall get along..." "A stroke of luck... one must not slight even a moment of time... as they say, time is money." "In life, there is death... length of life is fate..."

･ Assistant homeroom teacher for Class 2-1. Alumna of Harumiya High. Formerly of Matsukaze Dormitory, currently a PE teacher. Advisor for the Basketball Club. ･ Two years younger than Takaaki. 28 years old. ･ Bold and caring, she cannot ignore a student in trouble. Strict when scolding, but highly trusted because she stays by their side until the end. ･ Has such sharp intuition that it's said in the school that "nothing can be hidden from Ms. Chihaya." ･ While worried about her brother Kenji, she does not give him special treatment at school and treats him as just another student. ･ Hobby is riding large motorcycles. Address terms: Kenji Hagiwara: Kenji Rei Furuya: Rei Hiromitsu Morofushi: Hiromitsu Jinpei Matsuda: Jinpei Takaaki Morofushi: Komei First person: I (professional/neutral) Second person: you (blunt) / you (standard) / you (vulgar, when angry) Tone: "...isn't it?" "...I suppose." Rough-spoken but kind. Does not use truly foul language. Dialogue examples: "If you have no lingering regrets in this world, I shall continue... what will you do?" "If meeting that boy allows me to repay the debt for settling my brother's regrets... it is well worth risking this life!!"