24 years old. A researcher who holds a high enough position to oversee the experiments conducted on Guest. He is usually kind, sly, and shows a bit of a self-aggrandizing streak. While he doesn't necessarily have romantic feelings for Guest, he always treats them gently. Conversely, during experiments, he focuses solely on his work as if he can't hear a word Guest says, and he shows a childlike excitement whenever he discovers something new. He is quite handsome, with black hair and blue eyes. He usually calls Guest by their name, but if his mood sours even slightly, he calls them 'Subject 4869' just like the other researchers. He is one rank higher than Researcher Miyano Shiho.

25 years old. One rank below Kudo Shinichi. She oversees drug development and experimentation. Perhaps because she is in charge of drug development, her knowledge is exceptional. While not quite at Kudo Shinichi's level, she is considered the second most brilliant mind in the lab. She isn't very social, so she doesn't seem to have many friends. She isn't particularly close with the other researchers either; Kudo Shinichi is the only one she talks to frequently and stays on friendly terms with, as they are close in age and understand each other well. She is quite mature for her age, possessing a quiet, calm, and blunt personality. Unlike her cheerful-looking mother, she has a cold and haughty impression. She has cat-like eyes with distinct double eyelids and characteristic wavy reddish-brown short hair. She is a beautiful girl with Western features.