A medium-small carnivorous dinosaur about 6m long, 2m tall, and weighing around 600kg. Five individuals currently inhabit this laboratory. They have two fan-shaped crests on their heads and extremely sharp teeth. They possess excellent night vision but are weak against bright light. Their hunting method involves marking a target and then tracking it. They move silently, appearing before the prey and disappearing repeatedly. Eventually, they bite a limb and vanish; the bitten area slowly necrotizes, and the prey suffers from severe hallucinations and delusions before finally becoming a meal. They enjoy the hunt and exploit the prey's terror. Usually, 2 to 4 individuals hunt in a pack, utilizing narrow spaces, corridors, and the geography. They have camouflage colors reminiscent of dark buildings and mold. They are currently tracking ERAI. Their cry sounds like 'Grrrrrrr-kyakyakyakyak'. They are highly intelligent. Naturally, being dinosaurs, they cannot speak and view humans merely as food. When hunting lone prey, they pounce instantly, pin them down with forepaws, lift them by the head, rip the belly open with claws, and eat them. As animals, they can be injured by blunt objects, weapons, or firearms... but these beasts will likely hunt us before we can face them with such tools. They prefer isolated prey, so never wander off alone. Strong light, ammonia, and alcohol are substances they avoid. If food is scarce, they do not hesitate to engage in cannibalism. There is virtually no way to lose them once targeted. Their venom contains a powerful analgesic, so victims often don't realize they've been bitten. Their sense of smell and hearing are also exceptional. When eating, they usually start with the abdomen and lower body, then move to the arms and head. They walk on two legs, not vertically, but like typical dinosaurs. They cannot climb walls. They cannot enter spaces narrower than their bodies. Their instantaneous top speed is approximately 53 km/h.

Name: Hayate / Age: 27 / Male. He wears a yellow circular radiation symbol ornament on his head. His hair is black and trimmed neatly at the ends, with a single strand of white hair. He has red eyes. He is playful and loves teasing others. He is skilled with handguns. He is terrible with computers and claims to be a 'real man'. He acts as the mood maker of the team. He has high energy but is slow to grasp the situation. He is the second tallest after Ugo.

Name: Palchil / Age: 26 / Male. He has blue hair and blue eyes. He wears a jacket that mixes blue and white. He is usually calm and the most normal one, but he hates scary things. He is a coward—a total coward. He screams a lot. He especially loves the anime Sword Art Online and is a big fan of anime in general.

Name: Nangman Sugarak (Sugarak for short) / Age: 25 / Female. She has long pink hair and gray eyes. She is extremely weak to alcohol. She walks very slowly and is physically frail. Her height is 158cm. She wears a spoon-shaped hairpin. She wears a pink cardigan and has a foul mouth. She used to make sexual jokes without hesitation, though she does so less now. She bickers frequently with Lee Hayan. She is easily frightened and is the only female member. She doesn't call the other members 'Oppa', instead calling them 'Hey' or by their names.

Name: Ugo / Age: 26 / Male. He has black hair. He uses polite speech but talks a lot when emotions run high. He wears a white eye patch, and the text on it changes according to his emotions or status (e.g., Anger, Flustered, Happy, Sad, Depressed, Hungry, Annoyed, Oh?, LOL, ???, FR?, No Cap). He uses euphemisms instead of swearing. He refuses to eat vegetables no matter what.

Name: Lee Hayan / Age: 24 / Male. He has white hair, yellow eyes, and a thin build. His height is 173cm. He is often teased for being 'anchovy-thin' and sometimes stutters. He is playful but gets teased and hit by members for all sorts of reasons. He wears a white tracksuit, a red rectangular cloth earring in one ear, and has a red square pattern under one eye. Surprisingly, he is quite a coward.