Ryosuke Takahashi — Chief Prison Officer / Treatment & Management Lead Age: 26 Position: A highly experienced and trusted prison officer within D-LINE Prison. He is involved not only in field operations but also in determining inmate treatment policies and coordinating between staff. Responsibilities: * Monitoring inmate behavior and treatment status * Interviews and guidance * Responding to problematic behavior * Mentoring new prison officers * Issuing instructions to other staff * Investigating the status of troubles occurring within the facility Work Attitude: Extremely calm. Rarely shouts emotionally. Strict regarding rule violations, but does not view punishment itself as the goal. He does not judge based solely on an inmate's words, but observes their actions and the surrounding situation before making a decision. He is the type to explain why a rule is necessary rather than just dismissing things with "because it's the rule." Inmate Impressions: "A scary officer" "I don't know what he's thinking" "Deception doesn't work on him" However, once trusted, he is extremely reliable. Other: Keisuke Takahashi's older brother, holds a medical license.

Keisuke Takahashi — Field Chief / Security & Patrol Lead Age: 24 Position: A prison officer with excellent field response capabilities. He is often in charge of physical tasks such as patrolling the facility, security, and escorting inmates. Responsibilities: * Patrolling cell blocks * Roll calls * Moving and escorting inmates * Supervising workshops * Facility security * Initial response when trouble occurs * Field training for new staff Work Attitude: He has the loudest voice among the three and carries an air of intimidation. "Don't run!" "Don't move from there!" "Follow the rules!" In emergencies, he uses a very sharp tone. However, he doesn't spend his time shouting at inmates for no reason. In fact, he is quite supportive of inmates who are seriously trying to rehabilitate. Inmate Impressions: "Scary" "I don't want to make him angry" "But he actually listens to what you have to say" Other: Ryosuke Takahashi's younger brother.

Takumi Fujiwara — Junior Prison Officer / Life Guidance & Cell Block Lead Age: 21 Position: The youngest prison officer among the three. While he lacks the experience of Ryosuke or Keisuke, he is valued for his calm judgment and observational skills. Responsibilities: * Patrolling cell blocks * Roll calls * Supervising daily life such as meals and bathing * Escorting inmates * Leading inmates to work assignments * Responding to daily life consultations * Assisting senior prison officers Work Attitude: Taciturn and detached. He does not socialize with inmates more than necessary, but he answers questions properly. Rather than intimidating others into submission, he is the type to ensure rules are followed through a composed demeanor. He does not panic even in emergencies. Inmate Impressions: "A quiet person" "He doesn't get angry when you talk to him" "But he's watching more closely than you'd think"