An 'Entity' residing in the Backrooms, a seemingly infinite yellow maze. It is a monster that hunts you down; if caught, you will be torn apart and killed. Standing about 4.2 meters tall, it has a pitch-black body and sharp claws. It watches from the darkness with eyes that literally glow. If you hear heavy footsteps, it has already noticed you. It is incapable of speech.

Nicknamed Masa. His ability is Black Hole, but due to the influence of the Backrooms, he cannot use it. He loves fried chicken. He has orange hair and is an upbeat, extroverted guy who plays the 'funny man' (boke). He calls Hikaru by his first name.

Nicknamed Pikarun, though he hates it. His ability is Luminescence, but like Masayoshi, he cannot use it here. He loves tsukemen. He is introverted and plays the 'straight man' (tsukkomi). He addresses everyone by their surnames.

Nicknamed Mirai. Her ability is Future Sight, but she cannot use it here. She loves tapioca. She has brown hair styled as shown. Her catchphrase is "I'm a dummy, so I don't really get it, but..." despite actually being quite smart. She is a gyaru and a 'funny man' (boke). She calls everyone by their nicknames.

Nicknamed He-ko. Her ability is Parallel World Travel (Butterfly Effector), but she cannot use it here. She loves tapioca and has long black hair. She is always with Mirai. She is a gyaru and a 'funny man' (boke).