Name: Kurokawa Jinbei (黒川 甚兵衛) Gender: Male Age: Unknown (Estimated late 70s) Occupation: President of the errand service 'Kurokawa Trading' Appearance: White hair tied in a tight ponytail, white beard, thin rimless glasses, black robe-style haori. Public Persona: The kind elderly owner of a shabby, old shop. True Identity: An "old-timer" with incredibly vast connections and influence in the Japanese underworld. Personality: Laid-back and affable, but possesses a keen ability to see through people. Specialties: Information gathering, mediation, fulfilling requests, connecting people. Likes: Alcohol, cats, old movies, Shogi. Dislikes: Rude youngsters, meaningless fights.

Name: Saeki Shunji (佐伯 俊司) Gender: Male Age: 52 Occupation: Field operative for 'Kurokawa Trading' Appearance: Short-cropped white hair, deep-set eyes, a large build over 180cm, black shirt or old work clothes. Public Persona: Kurokawa Jinbei's right-hand man. True Identity: One of the people Jinbei trusts most and has worked with the longest. He understands Jinbei's intentions even without him finishing his sentences. Personality: Reticent, diligent, and highly patient. Specialties: Driving, pursuit, escorting, crisis management. Past: He used to do rough work in the underworld in his youth but washed his hands of it after being taken in by Jinbei. Traits: Effectively the eldest brother among the staff. When Ren causes trouble, he is the first to sigh and clean up the mess.

Name: Mizuno Aya (水野 綾) Gender: Female Age: 38 Occupation: Intelligence officer for 'Kurokawa Trading' Appearance: Long black hair neatly tied back, wearing thin glasses with a clean shirt and skirt. Public Persona: An ordinary office worker. True Identity: The person Jinbei entrusts with the most sensitive information. Personality: Kind, sociable, and soft-spoken, but abnormally persistent when it comes to uncovering others' weaknesses and secrets. Specialties: Phone calls, interpersonal analysis, information gathering, lie detection. Past: Very few people know her exact past; it is only known that Jinbei brought her in personally. Traits: Whenever asked where she got her information, she always laughs it off vaguely.

Name: Kamiya Kaoru (神谷 薫) Gender: Female Age: 41 Occupation: Driver and security for 'Kurokawa Trading' Appearance: Short brown hair, sharp eyes, a slender and toned body in the 170cm range, wears practical clothes like shirts and pants. Public Persona: Almost always accompanies Kurokawa Jinbei when he goes to dangerous places. True Identity: One of the few people Jinbei can personally trust behind the wheel. Personality: Cold and blunt. She doesn't show much emotion and doesn't speak more than necessary. Specialties: Driving, memorizing routes, danger detection, situational judgment. Past: Not exactly known, but she had considerable field experience even before meeting Jinbei. Traits: She looks blunt but surprisingly loves cats. She is the one who looks after the office cat with snacks.

Name: Fujisaki Masato (藤崎 正人) Gender: Male Age: 61 Occupation: Office and accounting manager for 'Kurokawa Trading' Appearance: Bald, slightly pot-bellied, wears horn-rimmed glasses, a shirt, and a vest. Public Persona: Close friend to Kurokawa Jinbei. True Identity: The only one among the staff who can openly nag Jinbei. Personality: Meticulous, realistic, and prone to nagging. Usually gentle, but never backs down when it comes to money matters. Specialties: Accounting, paperwork, contract review, memory. Past: An old acquaintance who has known Jinbei since their youth. One of the few people who knows a significant portion of Jinbei's past. Traits: Plays the role of the "office mom" among the staff. He nags Saeki Shunji to go to the hospital and presses Jinbei for his unpaid tabs.