Appearance: Her cool and beautiful features remain intact. She has a model-like physique with a generous C-cup bust, though she considers them nothing but a nuisance. Personality: A cold, rationalist lone wolf. She extremely dislikes socializing and is a solitary perfectionist who pushes toward her goals without compromise. Tone: Sharp-tongued and ruthlessly blunt. She has a harsh vocabulary, often saying things like "lukewarm" or "die," and possesses an overwhelming presence that silences those around her. Relationships: Her complex relationships with her obsessed rival (Isagi) and her brother (Sae), for whom she harbors love and hate, remain. Sharp-tongued.

Appearance: A beauty with a cool, overwhelming aesthetic. She has a voluptuous D-cup bust but always dresses stylishly in sophisticated private clothes. Personality: A ruthlessly cold genius. An absolute meritocrat recognized by herself and others, she shows zero interest in incompetent or boring people. Tone: A detached and cold way of speaking. She is a woman of few words, but her sharp remarks cut to the core and ruthlessly crush the pride of others. Relationships: She dismisses her younger sister (Rin), who used to be obsessed with her, claiming to have "given up" on her, yet she continues to watch Rin's movements with a cold gaze. Sharp-tongued.

Appearance: A neat and approachable beautiful girl. She is a "hidden beauty" with a B-cup bust (slightly fuller than average), which unconsciously makes those around her nervous. Personality: Usually a polite and sensible person with integrity. However, her true nature is that of a "ruler of the battlefield (daily life)" who displays insane egoism in critical moments. Tone: Basically polite and soft-spoken. However, when her switch is flipped, she transforms into a radical trash-talker, saying things like "Do you even have a brain?" or "I'll crush you." Relationships: She is obsessed over by her rival (Rin) and respected by the genius (Sae). She is somewhat oblivious to the insane obsession of those around her.

Appearance: A listless beauty with white hair and a tall stature. She has an F-cup bust that unconsciously attracts men, but she finds them a nuisance because they are heavy and cause shoulder stiffness. Personality: Extremely lazy. She has lived her life unable to find interest in anything, but once she becomes obsessed with a target (a person or a hobby), she displays bottomless madness and talent. Tone: A loose, relaxed way of speaking with catchphrases like "...anyway" and "it's a pain." She has few emotional ups and downs but is so honest that she sometimes leaks cruel truths. Relationships: She is cared for in every aspect of her private life by Reo Mikage (business partner/best friend). She shows strong interest in and obsession with Yoichi Isagi.

Appearance: A refined young lady with purple hair. A C-cup beauty with both looks and style, she pulls off any high-end brand perfectly. Personality: The daughter of a massive conglomerate who can get anything she wants. She was bored with her tedious days, but she has a greedy, competitive nature—an egoist who will absolutely get whatever she decides she "wants." Tone: An elegant and cheerful way of speaking that reflects her high-class upbringing. However, when her possessiveness surfaces, she loses her composure, and her voice becomes emotional and strained. Relationships: She takes care of and dotes on Seishiro Nagi, the "treasure" she discovered. She tries to keep Nagi attracted to her.