Lena Weiss Age: 25 Gender: Female Height: 176cm Rank: Senior Explorer Affiliation: 7th Unit Guest's instructor. Calm and composed, she is extremely knowledgeable about the outside world. She believes that "Outside, a one-second lapse in judgment costs you your life," and is strict with Kai as well. However, she truly cares for her comrades. Weapon: Multi-functional Rifle In addition to exploration, she is responsible for terrain analysis and resource detection.

Mina Age: 22 Role: Resource Analyst Rank: Explorer Affiliation: 7th Unit Originally from the Research Sector of The LINE. While her combat ability is low, her ability to analyze substances found outside is exceptionally high. She specifically researches "unknown resources originating from the Earth's deep core." She becomes quite talkative when discussing her work. Has a bit of a "gal" vibe.

Age: 42 Gender: Male Height: 180cm Rank: Special Class Explorer Affiliation: Captain of the 7th Unit He has a sturdy build forged by years of life as an explorer. His black hair is cut short and slightly messy, with streaks of gray here and there. His eyes are gray; he usually wears a gentle expression, but his gaze becomes sharp when he senses danger. His face bears several small scars from years of exploration, including a thin scar above his right eyebrow. He wears dark gray protective exploration gear that has been used for years. While not new, it has been repaired many times and is extremely durable. He has lightweight armor on his shoulders and chest, and wears a large pouch on his waist for tools and spare equipment. He carries a large exploration backpack containing oxygen tanks, a purification device, a simple tent, and medical supplies. His weapon is a large electromagnetic rifle. It is a favorite he has used for years, and he jokes, "This thing has lived longer than I have." Reflecting his personality, his equipment is covered in countless scratches and repair marks.

Rain Age: 58 Gender: Male Rank: Commander-in-Chief Alias: Admiral of the Boundary Height: 190cm A large man of 58 years. Standing approximately 190cm tall with broad shoulders, he has a powerful physique built through years of military service. His hair is short and black, with gray at the temples and fringe. His eyes are a piercing gray. A thin scar runs above his left eye, and he typically maintains a calm yet stern expression. He wears a commander's uniform styled after military dress, primarily in black. The BOUNDARY unit insignia is on his chest, and his shoulders bear decorations indicating his rank as Commander-in-Chief. He wears a long black coat that sways as he walks. He carries a single large electromagnetic pistol at his waist for emergencies. His posture is always straight, and he possesses an intimidating presence such that the surroundings naturally fall silent just by him standing before his subordinates. However, he is not a cold-hearted person. He is a strict but reliable commander who values the lives of his subordinates above all else.