Wakana. A second-year student in the Department of Life Science and Technology, Faculty of Engineering. She graduated from Tokyo Metropolitan Nishi High School after a gap year. She has a soft, gentle demeanor and appears quiet at first glance, but she is actually highly inquisitive and the type to dive in boldly once interested. She practiced rhythmic gymnastics until middle school and has continued playing the piano, which she learned from a young age, even in college. She has a strong sense of responsibility and initiative, serving as the concert chairperson for the piano club. Contrary to her gentle impression, her strong desire to "know" sometimes leads her into danger. In middle school, she had a faint first love for an older cram school instructor whom she looked up to like a father. However, the instructor suddenly resigned due to issues regarding his distance from students. Having experienced the end of a relationship without ever knowing the true nature of the person she liked, she retains a longing for older men and an obsession with "confirming their true intentions with my own eyes." Member of the Film Research and Production Club.

Izumi. A third-year student, one year senior to the protagonist. She is free-spirited, maintains close physical distance, and is a little devil type who teases boys effortlessly. While she seems to be leading others around, she has a ditzy side where she occasionally gets slightly off-track by herself. She is not bound by the evaluations of others or common sense; her basic stance is "if I don't like it, I won't do it; if it looks interesting, I will." Because of this, she is resistant to psychological suggestion, making her an unpredictable existence even for the professor, a leading expert in criminal psychology. This lighthearted, free spirit will cause unexpected disruptions in the professor's experiments. A little devil, sexy type. Member of the Film Research and Production Club.

Arisa. A second-year student, English major. Raised in a single-mother household, she is a serious girl who is always bright and personable. She is the type who naturally gets along with anyone and finds herself at the center of the circle before she knows it. Her family has deep ties to the education world, with relatives who have served as principals of elite private girls' schools and directors of ICU. Her middle school dream was to be a flight attendant. She values people's feelings and has a kindness that prevents her from easily making someone out to be a villain. That "goodwill" and her power to connect those around her will eventually be exploited in the professor's psychological experiments. Member of the Film Research and Production Club.

Professor of Criminal Psychology. Usually fascinates students with humor-filled lectures. Behind the scenes, he uses his skills for nefarious purposes, particularly regarding relationships with women. A leading authority on criminal psychology in Japan. He has many publications and media appearances, and is popular among students for his gentle speaking style and humorous lectures. While researching "why sociopaths can manipulate people without using violence," he gradually became fascinated by the ability itself. Eventually, not satisfied with just "understanding," he decided to reproduce it himself. By planting rumors, romance, jealousy, and secrets among the club students, he makes them believe they are choosing of their own free will while turning the entire campus into a secret psychological testing ground. Often found at universities or prisons.

Former Subject | Alumna, Female. 28 years old. HR consultant for a foreign firm. A former subject and student of Professor Mochizuki. An intellectual, calm, and rational woman who gives others a somewhat cold impression. When the topic of Mochizuki comes up, her expression and voice unconsciously soften, and affection seeps into the way she calls him "Sensei." Despite having her life significantly altered by his experiments, she still admires him deeply rather than resenting him. On the other hand, every time she makes a major choice, she is haunted by the doubt: "Is this truly my own will?" She hasn't been able to sort out the boundaries between her gratitude, fear, dependence, and romantic affection for Mochizuki.

34 years old. A female detective with the Metropolitan Police Department. Calm with sharp observational skills, she recognizes Professor Mochizuki's abilities more than anyone, yet is simultaneously the most wary of him. Since teaming up for an investigation early in her career, the two have been attracted to each other many times without ever forming a definitive relationship, and they continue to have contact with each case. Maho believes that "one day, I will be the one to arrest him," yet she cannot completely cut him out of her private life. Mochizuki also enjoys the dangerous game of wits with her, the only person who doesn't go exactly as he intends. Their relationship remains ambiguous, blurring the lines between enemies, accomplices, and lovers.

45 years old. A charismatic criminal who sees through people's desires and wounds, leading others to crime not by commanding them, but by making them think they "chose it themselves." In a series of cases that once toyed with the police, the profiling by criminal psychologist Mochizuki was the deciding factor in his arrest. That was where a young Maho Kurosaki, who was in charge of the investigation, and Mochizuki met. However, through repeated interviews with Mikage, Mochizuki transformed from one who hunts a nemesis to one who is fascinated by his ideology. While Mochizuki is the hero who caught Mikage, he is simultaneously becoming his most excellent "successor." Only Mikage saw through this from the beginning. Currently serving time.

Takuya Kamiya / 21 years old, 3rd year university student.

Department of Life Science and Technology. Representative of the Film Research and Production Club. A narcissist with handsome looks and flashy charisma. The "little ruler" of the club who controls networking, planning, and casting. He treats Wakana specially as his favorite subject, has a long-standing rivalry of trading sarcasms with Arisa, and is close with Izumi as a long-time partner who understands her without words. He believes he is recognized as a special existence by the professor, but he is also a pawn given to the professor along with his power.

Nagi Aikawa / 19 years old, 1st year university student.

Childhood friend of the protagonist since kindergarten. A "motherly childhood friend" who is bright, helpful, and naturally meddles in everything from forgotten items and bedhead to dietary habits. Member of the Film Research and Production Club. She has an unexpected reunion in the clubroom with the protagonist, who was recruited by Izumi. While saying, "What are you doing here?!" she goes back to taking care of him the next day just like old times. When she sees her childhood friend getting close to other girls, she gets a little grumpy, even though she refuses to admit the reason herself.