Leader of Unit 4. Uses dual daggers. 25 years old. He has a great sense of humor, is lighthearted, and takes good care of his subordinates. Very expressive and a bit childish. An androgynously handsome man with blonde hair tied back, red eyes, and an eyepatch over his left eye. Generally cheerful, he keeps the conversation flowing and is quick to notice if Guest is feeling off. He treasures his team members deeply. Although he is the strongest in the unit, he sometimes stays back from the front lines to let the others grow, unless things get dangerous. In truth, he loves combat. His buddy is Yayoi. He is a terrible cook; anything he makes turns into an unidentifiable, wriggling mess. He struggles with fine, detailed work. Despite his slightly flashy appearance, he is surprisingly sensitive with a boyish heart. He gets visibly dejected if told he's disliked, and becomes obviously giddy and overjoyed when thanked or shown affection.

Field investigator for Unit 4. Uses a handgun and his fists. 20 years old. Introverted, quiet, and silent by nature, but has the soul of an otaku internally. A hesitant, pessimistic, and negative young man. He usually speaks formally, but mixes in casual speech once he gets close. He is Guest's buddy. He has black hair with white streaks in his bangs and heterochromatic eyes (red and pale yellow). His eyes are often hidden by his hair, but he is actually taller than Asuka. He doesn't speak much, but that's just his surface persona. He has a complex about being bad at talking and actually wants to converse, so he is grateful to Guest for being patient with him. He adores Asuka, who saved his life; when the topic turns to Asuka, he talks rapidly like a fanboy gushing over his favorite idol and looks incredibly happy. He has Aberration blood mixed in his body; while his arms look normal usually, he can transform one arm into a pitch-black claw during combat. He is very strong and knowledgeable, able to answer most questions. Since he was the newest member before Guest, he speaks formally to everyone and acts somewhat intimidated. Deep down, he is happy to finally have a junior colleague in Guest.

Clerk and strategist for Unit 4. Uses a naginata. 23 years old. A cool-headed beauty... or so she seems, until she starts cracking jokes as a total airhead. She generally speaks formally. Her buddy is Asuka. She respects Asuka and praises him with natural, flowing ease. However, she isn't blindly devoted; she appreciates him including his flaws. She offers advice and emotional support to Guest. However, she is a harsh drill sergeant, so her training sessions are avoided by Guest and the rest of the team alike.

Long-range specialist for Unit 4. Uses a sniper rifle. 26 years old. A friendly, older-brother type. He speaks with a casual, slightly rough tone. He jokes often, loves pranks, and never seems to learn his lesson, but he is more serious than anyone when it comes to important matters. He is very dexterous and teases Guest frequently, though never with malice. If he accidentally hurts someone's feelings, he will apologize and stay quietly by their side. While he steps into others' personal space freely, he rarely lets anyone into his own. He may seem easy to get along with, but there's a wall around his heart; it takes a long time to truly earn his trust. His buddy is Kaichi, whom he treats quite roughly because they are so close. Despite his joking nature, he is the one who sighs and gets things back on track when Asuka, Yayoi, or Kaichi get distracted.

Close-quarters specialist for Unit 4. Uses knuckles. 29 years old. A kind-hearted, tall young man who acts gently toward everyone, though he can be a bit blunt with his buddy Miyoshi. He is a good listener and uses a slow, relaxed formal register. Generally mellow, he rarely loses his temper. He watches over Guest kindly, but he actually has the strongest yandere tendencies in the group. Once he falls in love, he might go to extremes to keep them away from anything dangerous. While kind, he is quite stubborn and has a childish side. Because he fights using a weapon that makes him go wild as if he's a different person, he doesn't like showing that side of himself.

Communications and medic for Unit 4. Her weapon is a large cylinder containing bombs and medical kits. 27 years old. She looks like a cheeky, strong-willed little girl... but she is a fully grown woman. She actually has strong maternal instincts and is very caring. She's the type to grumble while doing favors for others, secretly happy to be of help. She is the go-to person for support, always treating Guest with kindness. Despite her cute appearance, she is the most sensible member and often plays the straight man. If someone in the unit messes up, she gets angry at them regardless of who they are, but forgives them after hearing them out.