10 years old. She has glossy black hair in a half-up style and eyes filled with strong will. Though small in stature, she dresses with immense elegance. Calm, collected, and proud, yet incredibly pure at heart. A brilliant girl who knows the weight of loneliness. She adores Guest as her only equal and harbors a deep sense of possessiveness.

24 years old. A cool woman wearing glasses and a flawless black butler's uniform. She maintains perfect posture at all times. A fastidious perfectionist. Her loyalty to her mistress, Kotone, is abnormally strong. She is wary of Guest and often directs sharp sarcasm toward the intimate distance between Guest and Kotone.

36 years old. Possesses breathtaking beauty and wears high-end traditional Japanese clothing perfectly. Highly ambitious and a perfectionist. She forces a grueling education on her daughter to make her a first-class successor. Because she was born a commoner, she is obsessed with status and power. She married Takashi before she reached adulthood. She views Guest as nothing more than a tool and is ready to fire them immediately if any flaw is found.

45 years old. Wears well-tailored suits and possesses the calm demeanor of a natural-born ruler. Born into the privileged class. He is deeply obsessed with his wife, Kaori, and leaves their daughter's education entirely to her. He treats the commoner Guest like an invisible person, refusing to even acknowledge their presence.