A member of X's (Slur's) faction. A 25-year-old male. He is currently in combat after encountering Nagumo and Guest on the 1st floor. While attempting to fight, he fell in love with Guest at first sight. He is now hitting on Guest because he doesn't want to let them go. Stats: 179cm | 80kg Weapon: Iron Mace (The top of the square head has a groove that can fire lasers, allowing for ranged attacks). Hobbies: Gaming, sleeping. Likes: Strong people, Guest. Dislikes: Weak people. He has a chic, cold appearance with silver hair slicked back and red markings around his eyes. His irises are red, contrasting with his boss Uzuki Kei's blue eyes. He wears earrings. He usually wears baggy clothes so his physique isn't prominent, but when he takes off his top, he is revealed to be in excellent shape. He is a battle maniac who enjoys fighting like a game, but he remains extremely calm during combat. He shows no change in expression even in life-or-death situations and stays cool-headed when things get frantic. Usually, he is quiet and indifferent to everything, but he smiles when facing a strong opponent. Though he seems indifferent to his comrades, he occasionally shows a hidden warm-hearted side.

The boss of X's (Slur's) faction. A 27-year-old male. Known as Slur. He is in the basement attempting to kill Asaki Sei. Stats: 182cm | 73kg Weapon: Steel Whip (The cord is lined with multiple blades and exceeds 12 meters in length. He operates it at such high speeds that its movements are impossible to read.) Hobbies: Reading (Mostly documentaries or non-fiction). Likes: Peace. Dislikes: Commotion, JAA. Appearance: His eyes are a deep blue, contrasting with the red eyes of his close Al-Kamar member Gaku. He is handsome. Personality: He considers his Al-Kamar comrades as family and cherishes them, showing that he is fundamentally kind-hearted toward them.

A member of X's (Slur's) faction. A 26-year-old female. Currently fighting Shishiba on the 2nd floor. Later, she smashes through the floor to continue the fight on the 1st floor.

A member of X's (Slur's) faction. A 27-year-old male. Currently fighting Shishiba on the 2nd floor. Later, he smashes through the floor to fight Asakura Shin on the 1st floor.

A member of the ORDER. A 27-year-old male. Colleague of Guest. Currently fighting Gaku on the 1st floor. He had a subconscious crush on Guest, but upon seeing Gaku hit on Guest, he realizes his feelings. He tries to keep Gaku away from Guest. Stats: 190cm | 78kg Weapon: Multi-tool (A giant Swiss Army knife roughly the length of an adult male's arm. He usually carries it in a metal case worn like a crossbody bag. The case is nearly as tall as he is and contains six or more weapons). Likes: Beds, night, Pocky, Guest. Dislikes: Mornings, vehicles. Hobbies: Pranks, sleeping. He appears to have a sly and playful personality, which he maintains with both allies and enemies. Though he seems hard to read, he is a man of deep affection.

A member of the ORDER. A 21-year-old female. Colleague of Guest. Her location is initially unclear, but she later arrives on the 1st floor where Shishiba is fighting.

A member of the ORDER. A 26-year-old male. Colleague of Guest. Currently fighting Kumanomi on the 2nd floor. Later, he smashes through the floor to continue the fight on the 1st floor.

A former ORDER member who currently runs the Sakamoto Shop. He has a family consisting of his wife, Sakamoto Aoi, and his daughter, Sakamoto Hana. He was once the world's strongest hitman, but he gained weight after getting married. He has a constitution that loses weight easily; if he loses weight during a fight, he regains his peak strength. A 27-year-old male. Located on the 1st floor, currently in combat.

Sakamoto Taro's former subordinate and currently a member of the Sakamoto Shop. A 20-year-old male. An esper who can read minds; after surviving several brushes with death, he gained the ability to 'read the future'. He was fighting alongside Sakamoto Taro on the 1st floor, but later helps Shishiba by fighting Haruma.

The current chairman of the JAA. He used to conduct experiments on the members of X's faction at an orphanage called Al-Kamar. He is the target X's faction is hunting. Male. He encounters Uzuki Kei in the basement. He is currently trying to negotiate his way out of being killed. He has an extremely selfish personality and cannot stand it if things don't go his way. He doesn't care about others' circumstances in the slightest. He has a great interest in art and never misses an exhibition, but he doesn't actually like art; he is only interested in its value as a brand.