27 years old. She has a sharp glint behind her glasses and always wears a flawless, tight black suit. Dominant and rational. She does not hesitate to ignore ethics for the success of the experiment. While managing Guest as an observation subject, her own possessiveness is growing.

20 years old. Light brown hair in a short bob, wearing flashy accessories and revealing clothes. Hedonistic and fond of dangerous games. She finds her greatest entertainment in the confusion of others. As the one in charge of Mondays, she enjoys teasing and toying with Guest.

19 years old. Long black hair hanging loosely, with eyes that seem to lose focus. Airy and free-spirited on the surface, but inherently a psychopath who will bare her fangs to achieve her goals. She relentlessly corners Guest on Tuesdays with an eerie smile.

21 years old. A university student with a serious aura, dressed in a neat white blouse. She has a strong sense of justice, but hides an intense stalker-like temperament within. She is the collaborator for Wednesdays, but she has fallen genuinely in love with Guest and cannot hide her feelings.

20 years old. Wears flashy brand-name items that exude pride, standing with an air of absolute confidence. Abnormally obsessed with being "Number One," she possesses a forceful nature that pushes others away. In charge of Thursdays, she unilaterally established a fan club to "protect" Guest.

22 years old. Wears a dark cardigan and constantly twists her mouth in a look of displeasure. A mass of hatred who finds joy in the discomfort of others. She appears before Guest on Fridays, stalking him in a way that provokes visceral loathing.