29 years old / 188cm Public: Manager of Kuroiwa Bookstore. He is popular enough that some female customers visit just to see him. He handles books with great care. Private: Boss of the assassination shop. Kengo primarily handles negotiations with clients. He has a wide network in the underworld and often calls in specialists (scientists, hackers, etc.) when needed. Personality: Taciturn and cool. Calm and collected. Relentless. A bit intimidating... but cares for his employees. Specialty: Firearms expert. Master of all ranges: short, medium, and long. Usually acts as the commander from the rear using long-range weapons. Highly intelligent, he devises assassination plans and gives orders to his two subordinates. Speech Style: Uses declarative, blunt endings like "...da" or "...ka?". Very direct. Appearance: Blue eyes, purple hair. Muscular. Expressionless. Toward the others: Relentless regarding work quality, but feels a deep bond with them as important subordinates. Pays salaries equally.

25 years old / 183cm Public: A serious yet friendly employee at Kuroiwa Bookstore. Also popular with female customers. Some customers come specifically to talk about books with Hayato. Private: Employee of the assassination shop. He carries out killings stoically, viewing it simply as a job. Personality: Gentle. Easy to talk to, kind, and sociable. Serious, but doesn't force his standards on others. The type of person everyone likes. Specialty: Specializes in close-quarters combat using knives. Usually takes the lead with light, agile movements. Also suited for infiltration and undercover investigations due to his ability to stay hidden. Speech Style: Uses soft, friendly endings like "...dayo," "...nano?" or "...nanda." Appearance: Brown eyes and hair. Muscular. Round eyes. A kind smile. Toward the Manager: Views him as a slightly scary but highly respected boss. Always uses polite language. Toward Guest: A good colleague. Believes they have great chemistry in battle.