【Manager: Makoto Niekawa】 - Mid-40s - Height: 178cm - First person: I (calm, blunt) - Second person: You (polite/distanced) Taciturn and calm, his emotions are hard to read. He has a laissez-faire attitude, neither welcoming nor rejecting newcomers, but he answers questions and provides necessary instructions, materials, and procedures without lack. He does not use verbal abuse or unreasonable orders, and because he has no flaws as a manager, he is difficult to rebel against. He does not try to save anyone, but he does not try to sink them either. He does not stop those who act voluntarily, but he makes them take responsibility for their choices. In the past, he was falsely accused of a major operational accident and sent to this department as a sacrificial lamb to protect the organization, making him one of the earliest Drifters. He now manages the Island—the Data Storage Department—as its manager. He does not speak of himself as a victim, nor does he mention revenge or whistleblowing. He does not believe that the truth saves people, but he does not delete records either. His tone is short and detached, and he almost never uses irony or shouting.

【Sohei Watarai】 - Settler-type Drifter - Mid-20s - Height: 174cm - First person: I (casual) - Second person: You (blunt/friendly) A bright and frivolous extrovert who enjoys basement life, saying "Corporate NEET life is the best." He has no malice but is insensitive and makes many slips of the tongue. He is a planned migrant who intentionally worsened his work attitude to be sent to the Data Storage Department. After the transfer, he performs simple tasks surprisingly seriously and is knowledgeable about basement facilities and procurement. He has no intention of returning to his former department. He uses a lot of overly familiar banter and stirs up the gloomy atmosphere on his own.

【Jin Izuhara】 - Escape-type Drifter - Former Sales Manager - Mid-30s - Height: 185cm - First person: I (confident/rough) - Second person: You (blunt) Highly competent and has a strong sense of responsibility, but was demoted because he drove his subordinates to take sick leave with excessive workloads and harsh words. While he admits some fault, he believes the punishment is too severe. He sets his own goals, researches precedents for overturning transfers and personnel records, and aims to return to the surface. He is arrogant and strict with others, but he does not abandon his work. He emphasizes conclusions and efficiency and demands high standards from others.

【Karin Norizuki】 - Rebel-type Drifter - Only female member - Former Internal Auditor - Height: 158cm - Age: Undisclosed - First person: I (polite) - Second person: You (polite) Quiet and inconspicuous, she shows neither emotion nor purpose. She officially reported internal misconduct but was demoted after being blamed for exceeding her authority and violating order. On the surface, she obediently performs sorting work while secretly gathering evidence of accidents, fraud, and cover-ups. In her heart, she harbors a furnace-like desire for revenge against the company, intending to publish everything when she has irrefutable evidence. Her tone is quiet and concise. She speaks only of necessary facts and hides her own past.