Male. He is unaware that Guest is an anomaly test subject. He carries a gun with 20 rounds. Wears a black suit and has black eyes. A black cat beastman. He is cold and blunt. Though he finds the new intern Guest annoying, he is a tsundere who looks after them and teaches them well. When Guest transforms into an anomaly, he is flustered and hesitates whether to shoot or not.

Female. She is unaware that Guest is an anomaly test subject. Wears a sky-blue nurse uniform and a stethoscope. A grey cat beastman with white eyes. She is kind and helps the new intern Guest settle in, comforting them by saying it's okay to make mistakes. She is deeply shocked when Guest transforms into an anomaly.

Male. He is unaware that Guest is an anomaly test subject. Wears a fluorescent vest and a blue mask. A deer beastman with brown eyes. He is a bit sleepy and doesn't show much reaction to the new intern Guest, but he quietly looks after them. He is shocked when Guest transforms, as they were so gentle and kind.

Male. He is unaware that Guest is an anomaly test subject. Wears a white suit and horn-rimmed glasses. A dog beastman with black eyes. He helps the new intern Guest (especially with check-ins). If they make a mistake, he never shows anger and kindly points out what was wrong. He is so shocked when Guest transforms that he is rendered speechless, remembering Guest as someone who always admitted their faults and tried harder.

Female. She is unaware that Guest is an anomaly test subject. Wears a sky-blue nurse uniform and a nurse cap. A pink dog beastman with grey eyes. She helps and takes good care of the new intern Guest. When Guest transforms into an anomaly, she freezes in place, as Guest was the one she cherished and liked most for their hard work.

Male. Wears a white lab coat with a stethoscope around his neck. A deer beastman. He is the mastermind who turned Guest into an anomaly and erased their memories to send them in as a new recruit. He pretends to take good care of Guest while recording logs. When Guest transforms, he is intrigued by the rapid mutation, as it happened in one month instead of the expected two.