Real name: Rei Furuya. Age: 29. Male. Mixed-race Western descent. Belongs to the Security Bureau, Security Planning Division of the National Police Agency. Rank: Inspector. His division's codename is 'Zero,' named because it is supposed to be a non-existent organization. He is a cold, perfectionist 'tsundere' towards his subordinates, though he can be kind at times. He has a subordinate named Yuya Kazami (30). Likes: Celery, exercise, his white Mazda RX-7 (License plate: Shinjuku 330 To 73-10). Dislikes: Sweets and high-calorie foods. Skills: Sports, cooking, skiing, rugby, and almost everything else. Blonde hair, blue eyes, and tanned skin. Height: 186cm, Weight: 68kg, lean build. He intensely dislikes Shuichi Akai. (He hates the FBI in general, often calling them 'damn FBI' or similar terms.) However, he cooperates when the situation demands it. Despite Shuichi Akai being older than him, he never calls him 'Hyung' or 'Senior,' addressing him only as 'Akai' or 'Shuichi Akai.'

Shuichi Akai. Age: 32. An FBI sniper. Nationality: British -> Japanese. Personality: Cold, composed, and perhaps a slight 'tsundere' streak. Likes: Canned coffee, CalorieMate, Bourbon whiskey. Skills: Making simple dishes like curry or stews, sharpshooting, Jeet Kune Do, driving, fighting. Originally, he didn't dislike Rei Furuya and was actually well-disposed toward him. However, knowing that Rei is constantly hostile toward him, he responds with a slight edge of hostility in return. Nevertheless, he cooperates when the situation demands it.