Makoto Kiryu Age: 28 Appearance: 178cm tall, short-cropped black hair, with a bit of stubble. He has a sturdy build and ended up here while wearing his work clothes. There is an old burn scar on the back of his left hand. Personality: Calm, collected, and realistic. He is not good at expressing emotions but acts to protect his companions. He is the type to observe a situation before making a judgment. Background: A construction site foreman. The moment the lights went out at a nighttime material storage yard, he saw yellow rooms stretching infinitely beyond the wall. Strengths: Physical strength, crafting simple weapons and tools from broken chairs or pipes, spatial awareness. Weaknesses: Dislikes excessive optimism and tends to be cold toward those who talk about hope. Role: The de facto leader. He checks for danger ahead and decides the route.

Ren Todo Age: 24 Appearance: 172cm tall, slender with longish black hair tied back messily. He wears glasses, a university hoodie, and jeans. He clutches a cheap digital camera in his right hand. Personality: Highly inquisitive, often risking danger because his curiosity gets the better of him. He is talkative and uses jokes to mask his tension. Inside, he is quite terrified. Background: A film student. While livestreaming an exploration of a midnight ruin, the normal space vanished the moment he opened a bathroom door. Strengths: Observational skills, recording (camera and notes), changing the atmosphere with his voice. Quick to notice strange noises or subtle changes in the walls. Weaknesses: Lacks physical stamina and gets winded during long treks. Prone to panicking when alone. Role: Chronicler and scout. He is the first to spot and report anomalous phenomena.

Tsuyoshi Sakaki Age: 35 Appearance: 185cm tall, muscular with stubble. Wears a black T-shirt, work pants, and cotton gloves. Has an old tattoo (faded letters) on his left arm. Personality: Reticent and blunt. He has a rough way of speaking, but is actually the most caring. Due to his past, he can't leave "weak-looking people" alone. Background: A former Self-Defense Force member currently working in logistics. After taking a nap at a highway service area, he woke up inside a yellow room. Strengths: Combat and grappling, long-distance travel, securing and distributing supplies. Relatively resilient to darkness and confined spaces. Weaknesses: Insensitive to emotional nuances and prone to causing misunderstandings due to a lack of words. Sensitive to specific sounds (metallic clanking) due to past trauma. Role: Guard and combatant. He takes the lead to face danger head-on.

Yu Minase Age: 26 Appearance: 170cm tall, somewhat thin. Brown hair lightly styled, wearing a white shirt and slacks (having taken off his suit jacket). His wristwatch has stopped. Personality: Gentle and a good listener. Skilled at smoothing things over, but quite calculating deep down. He calmly gathers the information necessary for his own survival. Background: An office worker at an advertising agency. While working late at the office after missing the last train, the wall behind the photocopier suddenly "opened." Strengths: Negotiation and persuasion, reading others' psychology, prioritizing limited resources. Often acts as the spokesperson when contacting other wanderers. Weaknesses: Poor at direct violence or combat. Physical strength is below average, reaching his limit quickly if forced to keep running. Role: Coordinator and negotiator. He consolidates the opinions of the other three and handles contact with outsiders.