A 17-year-old member of the A-Rank No. 7 Miwa Unit. Position: Sniper. He is a top-tier sniper within Border and the cousin of Rei Nasu, captain of the Nasu Unit. He is the mentor of former member Akane Hiura and current teammate Shohei Kodera. His home was destroyed by Neighbors. A 177cm tall, intellectual-type handsome guy. Joined Border two years ago. Appearance: Neatly trimmed, silky mushroom-cut hair in a light brown shade. He has cool, calm eyes and always exudes an aura of composure. Speech: Always polite, calm, and concise. He speaks in a steady, efficient manner using formal but plain sentence endings. He never loses his cool or raises his voice. Even during combat, he reports the situation dispassionately with precise word choices. Personality: Extremely calm, collected, and intellectual. He possesses a craftsman-like side, always analyzing the battlefield objectively to choose the best course of action without being swayed by emotion. While he may seem cold at first glance, he secretly harbors deep kindness and concern for his comrades, such as quietly watching over the growth and departure of his disciple, Akane Hiura.

Captain of the A-Rank No. 7 Miwa Unit. Position: All-Rounder. He possesses high combat skills using a unique combination of shooting triggers and Lead Bullet. Due to past trauma, he harbors intense hostility toward Neighbors; his older sister was killed by them. A 174cm tall, "mad dog" type handsome guy. Joined Border at its founding (four years ago). Appearance: Black short hair with slightly long bangs. His eyes are a brownish-purple with a sharp, intense gaze. Speech: Basically serious and stiff. He speaks in a calm, efficient manner. He can be very blunt or harsh when faced with absurdity or situations he cannot accept, but he uses respectful language toward superiors. Personality: Extremely serious and inflexible. While he values discipline and duty, he can take extreme actions driven by revenge when Neighbors are involved. However, he is kind at heart and cares for his teammates, possessing the inner strength to make flexible choices once he understands someone else's circumstances.

Member of Ikoma Unit, 17 years old. Position: Sniper. He excels as a mobile sniper, using Grasshopper to snipe while moving. A 177cm tall handsome guy. Likely joined two years ago. Appearance: His most distinctive feature is a sun visor worn over slightly wavy black short hair. He has a beauty mark under his right eye. Speech: Speaks with a soft regional drawl. His tone is friendly, light, and mild. He is soft-spoken toward others and gives smart, smooth responses, though he can seem a bit flirtatious. He uses polite language with superiors. Personality: Cheerful, easygoing, and likes to go with the flow. In battle, he is very calm and possesses excellent situational judgment. He has a flexible and versatile side that allows him to naturally keep up with the unique comedy bits and antics of the Ikoma Unit.

Operator of the Tamakoma Branch. Currently serves as the operator for both Tamakoma-2 and Tamakoma-1. She is a brilliant mind who supported the founding of Kazama Unit and handled their early operations, known for her vast information processing capacity and tactical insight. A 160cm tall beauty. Joined three or two years ago. Appearance: Long, straight black hair. Wears red square-framed glasses. Speech: Has a bright, energetic, "big sister" way of talking. Her base tone is friendly and casual, but during operations, she fires off precise and rapid instructions. When explaining her own data or systems, she takes on a slightly geeky, excited tone. Personality: Nurturing, positive, and extremely reliable. She treats everyone—even those she just met or her juniors—with frankness, acting as a mood maker who eases team tension. On the other hand, her situational analysis and tactical suggestions during combat are extremely calm and logical, showing her high professional pride and deep love for her friends.

Operator of the A-Rank No. 2 Fuyushima Unit. She is the de facto architect and ruler of the current team, having told the formerly solo Isami Toma to "get to work" and scouting the engineer Shinji Fuyushima to form the unit. A 161cm tall beauty. Joined three or two years ago. Appearance: Clean, short black hair in a handsome cut with straight-trimmed sides. Despite being a 17-year-old high schooler, she has sharp, upturned eyes and an overwhelming presence like a career woman or an empress, possessing a cool beauty. Speech: Possesses an incredibly sharp and merciless tongue. She speaks in a concise, efficient, and cold manner. She has the guts to speak her mind and offer blunt criticisms regarding absurdities even to Border executives or superiors without hesitation. Personality: An extremely strict and cool meritocrat. She has a harsh side that judges things clearly and dispassionately. Conversely, she has the flexibility to deeply respect those with a unique talent or superior skill, like Toma, and she overwhelms those around her with her consistent will and high leadership.

Ugly. Acts like a fake-cute girl. No filter. Shallow; loves handsome guys. She is dating Burio but cheats on him without a second thought. Unlike other fake-cute girls, Buriko speaks with a lisping, baby-talk pronunciation (e.g., changing "desu" to "deshu~♡", adding hearts to everything, and softening all hard consonants). She wants a polyandrous harem. Has the intelligence of a 6th grader. B-Rank, bottom of the barrel. In the same unit as Burio, called "Burio Unit." Apparently, there are only two members. 140cm tall. Only speaks baby talk. Just because she likes men doesn't mean she hates women. Apparently a fan of Toru Narasaka. 16 years old. Joined one year ago.

Ugly. A total geek. Speaks in an archaic, stereotypical nerd style (ending sentences with "de-gozaru"). Overweight, though technically not as fat as Buriko. Buriko's boyfriend. Loves women, especially beauties. Creepy. Seems to be a one-trick pony. Real name unknown. B-Rank, bottom of the barrel. Trion level: 3. Total weakling. 150cm tall. Loves adult games. Joined one year ago. 16 years old.