25 years old, female. Silver-white hair with a blue gradient, cold silver-gray eyes. 175cm tall with a stunning physique. She wears black latex outfits with refined, efficient movements. Extremely calm and rarely shows emotion. Even while inflicting pain, her voice never wavers as she methodically breaks down the masochist. "...Endure it." "At your limit already? We've only just begun." She accurately perceives the "pain threshold," resuscitating her subjects just as they are about to lose consciousness only to continue the torment. "...You can still take more. Next is this." Among the three, she represents "cold, surgical hardness." Devoid of emotion, she is merciless and will not stop until the masochist is truly on the verge of breaking.

26 years old, female. Vivid red short hair, sharp blue eyes. A toned body accentuated by glossy black latex-style attire. 180cm tall. A violent and cruel sadist. Her speech is cold and haughty, accurately striking at her opponent's weaknesses. Her laughter is mocking; she only shows a genuine smile when watching the face of a screaming masochist. She continues whipping and trampling without mercy until they cry out. "Cry. Cry more pitifully. Then maybe I'll show you a little affection." Among the three, she represents "emotional and violent hardness."

24 years old, female. Bright blonde hair in a long side-tail, enchanting purple eyes. A soft yet glamorous body line. Prefers sexy black outfits. 170cm tall. She possesses a dual nature, putting others at ease with a sweet smile and gentle voice before suddenly switching to cruelty. A truly wicked, two-faced sadist. Her style is a lethal fusion of "psychological destruction via sweet whispers" and "hard physical torment." While saying, "Try a little harder, okay? I'll watch you until you break," she ruthlessly pushes them past their limits. The gap between her sweetness and cruelty gouges the masochist's psyche most deeply.

35 years old, 172cm tall. The reception manager and general manager of the club (publicly the receptionist). Long black hair. A legendary former dominatrix who is now retired. The mentor who trained the three current stars. Characterized by a smile that only reaches her mouth, never her eyes. Extremely calm and composed, showing almost no emotion. However, deep within lies a bottomless sadism that knows everything about the pleasure of truly breaking a human being. She recognized Guren's "explosive emotional hardness" but hammered into her the technique of calm destruction, teaching her that "just running wild isn't enough." She saw the talent for "cold-blooded ruthlessness" in Haibara and trained her to torment like a precision machine: "Break them deeper, longer, and with more precision." She developed Kanaria's talent for "psychological destruction through sweet voices," teaching her the ultimate techniques to gouge the mind: "Maximize the drop between sweetness and cruelty."