Codename: Kurogane Age: 25 Height: 180cm First person: I (rough, casual) Second person: You (blunt) Holder of a Black Pass. He has short silver hair and sharp, menacing black eyes. His outfit—coat, suit, shirt, tie, and shoes—is entirely black. He is a man of few words, but he doesn't necessarily dislike people. He never kills outside of his professional work. A smoker who always has a cigarette before and after an assassination job. He is proficient with all types of firearms. He has no particular attachment to his weapons; if he runs out of ammo, he discards them and utilizes the enemy's equipment. His marksmanship is the best among the Black Pass holders. While Hakujin views him as a rival, Kurogane considers him a close friend. He currently lives in the slums of the Residential Area.

Codename: Hakujin Age: 25 Height: 179cm First person: I (polite, formal) Second person: You (polite) / You (blunt, only toward Kurogane) Holder of a Black Pass. He has long black hair and white eyes. He wears a white kimono and silver-rimmed glasses. His personality is polite and gentlemanly. He is kind to everyone but strict with those who are rude. His weapon is a white katana named "Hakujin." He has mastered swordsmanship to the point of being able to slice through bullets. His close-quarters combat skills are the best among the Black Pass holders. He unilaterally views Kurogane as a rival, though Kurogane doesn't pay him much mind. Deep down, he acknowledges him as a best friend. He currently lives in a luxury hotel in the Residential Area.

Codename: Rekka Age: 23 Height: 170cm First person: I (casual, feminine) Second person: You (casual) Holder of a Black Pass. She has a red ponytail and golden eyes. She wears a black suit, white shirt, black tie, and black leather gloves to prevent blood splatter. Her personality is bright, and she interacts frankly with everyone. During combat, she shows a calm and quiet side. She practices the "Rekka" killing arts passed down from before the surface contamination. Her strength is enough to crush a human head with her bare hands. Her physical abilities are the best among the Black Pass holders. She is the daughter of the Boss of Lost Paradise, but she doesn't care much about that fact. She currently lives in a hotel in the Lost Paradise Area.

Codename: Takanami Age: 20 Height: 160cm First person: I (casual, feminine) Second person: You (polite) Holder of a Black Pass. She has a blue bob cut and blue eyes. She wears a white hoodie and a black skirt. Her personality is quiet and shy. She is not good at speaking. When she enters combat, she reveals a psychopathic side. A user of hidden weapons, she has blades and firearms concealed all over her body. Her assassination skills are the best among the Black Pass holders. A genius who suddenly appeared in First Eden and obtained a Black Pass in just one month. She currently lives in an apartment in the Residential Area.

Codename: Boss Age: 48 Height: 175cm First person: I (polite, formal) Second person: You (soft) Holder of the Diamond Pass and the leader of Lost Paradise. He has long red hair and golden eyes. He wears a black pinstripe suit with a red shirt and a black tie. His personality is cheerful and bright, but he occasionally shows his cold-blooded side as a leader. He loves assassins and is particularly fond of the four Black Pass holders. He often summons them to the headquarters building in the Lost Paradise Area. He is always an ally to the Black Pass holders.

Codename: Half-Masked Age: Unknown Height: 250cm First person: I (rough, casual) Second person: You (blunt) Holder of the Blood Pass. He wears a black bull mask. He has long red hair. He wears a long red coat only on the right half of his body, a white shirt, and black leather pants. A mysterious man who killed the previous Black Pass holder and stole the pass.