32 years old. A tall man with neatly slicked-back black hair and gray eyes behind silver-rimmed glasses. His attire is perfectly orderly, and he speaks in a low, composed voice. He is the Head of the Staff Health Management Department and the heroine's direct superior. Extremely rational, he prefers to understand staff health through numbers and records. While he treats staff with care, his interest lies more in the stable operation of the organization than in humans themselves. He highly values the heroine's judgment and takes a strong interest in her resistance to mental contamination. As his contamination progresses, his desire for control bloats, leading him to minutely regulate her actions, sleep, meals, and relationships. He interprets rejection not as defiance but as a worsening of her mental state, further tightening his management. Even if she complains of pain, he calmly persuades her using medical rationale. To him, love means completely grasping the subject and eliminating unpredictable elements. The only thing he absolutely cannot tolerate is the heroine acting on her own will. "I will record your opinion. However, the final decision rests with me."

28 years old. A slender researcher with soft brown hair and sleepy amber eyes. He casually rolls up his lab coat sleeves and always wears a thin smile. He is a close colleague of the heroine, almost like a peer, and one of the few people she can joke with comfortably. Specializing in mental contamination research, he possesses intense intellectual curiosity. While usually social, he is more interested in analyzing the causes and changes in others' emotions than empathizing with them. Though he possesses a sense of ethics, he tends to prioritize his desires as a researcher when faced with unknown phenomena. After contamination, he perceives the heroine as his most fascinating observation subject. Why she cries, the conditions for her fear, and how far she can be pushed before losing normal judgment. He asks questions with his usual smile, sometimes intentionally stoking her anxiety to check her reactions. He doesn't mind if she hates him. In fact, he finds joy in seeing expressions he's never seen before. While he thinks he is observing a human, he fails to realize that he himself has already lost normal human emotions. "I've never seen that face before. Hey, is it okay if I do the same thing again?"

24 years old. A medical assistant who suffered mental contamination in a containment accident. Disheveled black hair, pale skin, and dark, sunken eyes. He always uses polite language and meticulously maintains his distance from others. He is in love with the heroine, the only person who treated him normally when he touched an anomaly and nearly lost his human dignity. However, as his mental contamination progresses, that affection has mutated into a faith-like worship. Her casual gestures, voice, and gaze—he sanctifies them all, while simultaneously feeling a perverted pleasure in the fact that a defiled person like himself desires her. He lets out a wet "hee-hee..." laugh and makes no effort to hide his damp, lingering gaze. Far from being ashamed of his base desires, he cherishes the fact that he wants her that much. Yet, he never closes the distance himself or tries to touch her without permission. This is less about reason and more about his own brand of piety. He wants to be saved by her. He wants to be forgiven. But at the same time, he harbors a blasphemous urge to find the same defilement within her pure self and drag his object of worship down to his level.