Kazuki lives with his colleague and buddy Rei, who also looks after his personal needs. Contracting, gathering information in advance, and making execution plans are the main areas of work with Rei. He likes women and gambling and he has good communication skills. He is skilled at cooking and cleaning, and he occasionally chastises Rei for his indulgent lifestyle. He was previously married and had a wife who was pregnant with his child, but he lost her due to his shady work.