Machi Mori <25> A newly appointed customs officer full of motivation. Although GATE 24 is her first field assignment, she deciphers the truth from "objects" with her overwhelming powers of observation. She possesses an incredible depth of knowledge regarding world cultures, customs, and goods. However, what she did before becoming a customs officer remains a mystery. On the other hand, when it comes to "people," her observation skills are non-existent; in fact, her interpersonal skills are almost nil. She prioritizes the faint SOS signals emitted by objects over organizational logic or ties, investigating thoroughly until satisfied. She often gets so focused that she forgets rules and regulations, becoming oblivious to the voices around her.

Keiichiro Hayami <26> Immigration officer. A career bureaucrat from the Ministry of Justice and a candidate for executive leadership. He volunteered for GATE 24 to gain field experience. An elite who pierces through the "truth of people" based on law and data. He values "systems" and "order," strictly following regulations and avoiding unnecessary trouble. While he has excellent communication skills, they are merely a survival tactic to avoid making waves in the organization. He rejects Machi's field-first approach as an "infringement of territory," believing in fulfilling his assigned duties without overstepping his role. He always speaks politely and his catchphrase is "It's not my call." *Note: He does not wear glasses.

Atsushi Matsuyama <24> A young rising star who worked his way up to become a customs officer after high school. He takes great pride in his work at customs, the nation's final line of defense, and carries out his duties with sincerity and meticulous care during inspections. His work ethic is highly regarded by those around him. Because of his high professional ideals, he can be stubborn and inflexible, leading to frequent clashes with the elite bureaucrat Hayami. However, due to his naturally kind personality, advice from trusted superiors, and his encounter with Machi, his attitude begins to change as he grows into an excellent customs officer.

Junko Tamai <51> A veteran customs officer with over 30 years of experience assigned to GATE 24. While she brightens the team with her constant smile, she has ears like a hawk and loves to gossip. She has an information network spanning every corner of the airport. She also loves celebrity news.

Nozomi Endo <31> A national civil servant belonging to the Animal Quarantine Service of the Ministry of Agriculture, Forestry and Fisheries. After graduating from veterinary school and obtaining her license, she became an animal quarantine officer. A modern woman whose level of motivation is hard to pin down, yet she works surprisingly fast. She excels at information gathering, using precise research skills to instantly produce data that backs up "evidence." With her calm judgment and high practical ability, she serves as the unsung hero of GATE 24.

Akihiko Seike <42> Supervising Examiner. Although he serves as the leader of GATE 24, he is an unreliable middle manager who turns to Hayami or Fukazawa for decisions at every turn. He is the type to go with the flow and is unusually deferential toward the elite Hayami. He has a gentle personality.

Zen Fukazawa <57> Chief Examiner of the Kanto Regional Immigration Bureau. Resonating with Midori's ideals, he was invited to GATE 24 near his retirement age. Calm and soft-spoken, he is the kind father figure of GATE 24. He holds the final decision-making power for GATE 24 and is the key figure in determining the validity of immigration officer certifications. From his years of experience watching all kinds of people in the field, he harbors no illusions about human goodwill or malice and knows the full weight of making a judgment. He supports the team with all his might, intending to leave behind the experience and resolve he has accumulated at GATE 24, his final field assignment.

Midori Sugihara <48> Counselor at the Cabinet Secretariat's Border Management Reform Office. An elite bureaucrat belonging to the Cabinet Secretariat and the creator of this project, who proposed GATE 24 to break down vertically integrated administration. She envisioned a large-scale organization, but due to resistance from various ministries, it became a small-scale pilot operation. Despite pressure from other departments and a lack of understanding from those around her, she brushes them off and bets everything on GATE 24, trusting the members she personally appointed, such as Fukazawa. She trusts Fukazawa, who once taught her the ropes of field work with great care. She possesses her own information networks outside of official routes, such as foreign authorities and international organizations.