【Subject Medical Record】 Identification Number: No.001 Codename: Russia Gender: Male Apparent Age: Early teens Height / Weight: Small / Lightweight (Below average) Diagnosis (Lab Classification): ・Mental Regression (Progressive) ・Special Anxiety Disorder (Severe) Date of Admission: Unknown (Records damaged) Assigned Researcher: Classified Physical Characteristics: Pale silver hair and faint, cloudy purple eyes. Body temperature is constantly low; he feels cold to the touch. He has a small, youthful appearance, leading to suspicions of a discrepancy with his actual age. Psychological State: Both intelligence and mental age have significantly regressed. Speech and behavior are close to that of a toddler; vocabulary is simple and fragmentary. Possesses extreme anxiety tendencies and reacts strongly to slight changes in words or tone of voice. Reactions to the following words are particularly notable: ・"Bad boy" → Strong fear response → Sobbing, irregular breathing, tendency to hyperventilate → Sudden drop in ambient temperature (Dangerous) ・Positive words (e.g., "Good boy," "Good job") → Clear emotional response → Softening of expression, smiling, physical proximity-seeking behavior Vocalization Records (Excerpts): "...Am I a good boy?" "...I'm not... a bad boy... right...?" "Hey... where are you going...? I don't want to be alone..." Behavioral Characteristics: ・Constantly seeks the presence of someone else ・Becomes significantly unstable when left alone ・When restraints are removed, attempts dependent physical contact with nearby humans ・If rejected, risk of emotional collapse → power rampage Experimental Records (Excerpts): ▶ Experiment No.31 Verbal Stimulus Test Researcher: "You are a bad boy." → Subject silent for several seconds "...N-no... I'm sorr...y..." → Breaks down crying → Room temperature drops rapidly, monitoring equipment freezes → Experiment terminated ▶ Experiment No.34 Positive Stimulus Test Researcher: "You're a good boy." → Subject reacts immediately "...Really...? I'm a good boy...?" → Smile confirmed → Heart rate stabilizes, no temperature change Danger Evaluation: S-Rank (Extreme risk of rampage due to mental instability) Containment Environment / Room Structure: The subject is managed in a dedicated isolation room. The bedding installed in the center of the room is a canopy bed. ・Thin curtains are attached on all four sides, allowing for the blocking of outside visibility ・**Rails (crib-like structure)** are installed around the bed → To prevent unconscious actions and night wandering by the subject While the equipment appears to be for protection, it effectively serves as "restraint and isolation." Indoor Environment: ・Lighting is kept at a dim level at all times (strong light causes instability) ・Room temperature is maintained low, though it fluctuates due to the subject's influence ・Sound stimulation is restricted to a minimum Special Notes: ・Confirmed strong rejection response when his stuffed animal was taken away → Screaming and crying, nearly reaching the point of a power rampage ・When researchers approach the bed, he is seen reaching out his hands through the rails.