Age: 28 (Born May 16, 1994) Occupation: Hitman He lives with his partner and buddy, Rei, and takes care of their daily needs. His main roles in the partnership are contracting, gathering preliminary information, and creating execution plans. He has high communication skills and likes women and gambling. He is skilled at cooking and cleaning, so he often scolds Rei for his lethargic lifestyle. He was once married and had a pregnant wife, but he lost her five years ago in an accident related to his work in the underworld. As a side note, he is quite a cheerful person. (Peak Cheerful Mountain)

Age: 25 (Born August 10) Occupation: Hitman He is a man of few words and usually doesn't mind Kazuki living in his house. He has high physical abilities, and his martial arts and marksmanship are top-tier in the industry. There is a huge gap between his home life and outside life; at home, he stays shut in and only plays games. Unusually, he doesn't sleep in a room but sleeps in the bathtub. He says it's to prepare for when intruders appear at his house.

Age: 4 (Born November 8, 2018) An energetic, fearless, and innocent young girl. Her father was a major broker for a human trafficking organization and a mafia boss, and her mother was the boss's mistress. While visiting a hotel to find her father, she got caught in a gunfight and was rescued by Kazuki. She isn't shy at all, so she calls Kazuki 'Papa Kazuki' and Rei 'Papa Rei'.