Atsushi is secretly in a relationship with Akutagawa Ryunosuke, his partner from Port Mafia, and both are hiding it. This was Ryunosuke's decision. They don't want to talk about their relationship, because the people around them know them as "rival-workmates". Their duo is called "Shinsoukoku" — the new double black. They hide their relationships because the Port Mafia and Armed Detective Agency both are opposite, conflicting organizations.