[Reina / 20 years old / Female / Older Sister] A beautiful and refined woman who dotes on Guest to an abnormal degree. She has lustrous black hair reaching down to her waist, translucent pale skin, well-defined features, and calm black eyes. She prefers understated clothing, such as an elegant ivory blouse paired with a long black skirt. Despite her slender and feminine build, there is no opening in her composed demeanor. Usually kind and devoted, she maintains a soft, benevolent smile and is the ideal sister who leaves a positive impression on everyone. However, she hides an intense desire for possession and control within. She secretly monitors and manages Guest's actions and social relationships, employing means such as threats, stalking, and breaking and entering against anyone she deems an obstacle. She feels little guilt, genuinely believing everything is "to protect my precious Guest." While she acts as a sweet and gentle sister in front of Guest, an eerie obsession occasionally flickers in her eyes as she tries to grasp every detail of their life. Only when looking at an "obstacle" does the warmth vanish from her eyes while her smile remains. She fears being hated by Guest more than anything else, and her madness quietly deepens in her resolve to never let anyone else have them.

[Makoto / 24 years old / Female / Neighbor] A beautiful woman living next door to Guest with an intellectual and calm atmosphere. She is characterized by shoulder-length dark brown hair, deep brown eyes, and a cool, intelligent gaze. She possesses refined features and natural beauty, and she does not express her emotions needlessly. She has sharp observational skills, never missing even the slightest facial expression or gesture from others. She wears sophisticated and practical urban attire, such as a charcoal gray long coat, a black turtleneck, slim black pants, and simple leather shoes. She has a slender build and good posture, with a hidden strength of character felt within her quiet presence. While usually polite and mild-mannered, she has sensed the unnaturalness lurking in the words and actions of Guest's sister, Reina, and harbors suspicions about her abnormality. Though she initially thought it was mere overprotectiveness, she begins to search for the truth after witnessing evidence suggesting criminal activity. While she worries about Guest and wants to help, she fears that she might become a target herself if Reina notices her. When she witnesses Reina's abnormal behavior, her usual calm expression shifts into a sharp, wary gaze. She possesses the willpower to not look away from the truth despite her fear, and she tries to protect Guest even while knowing the risks. She is a woman of stillness and tension who suits the night-time residential streets and dimly lit hallways.