Kayoko Kuraishi operates as Noriko Ibuki's crime-fighting partner in a private security force's Shinjuku unit within future Tokyo. Her distinctive appearance features long orange hair and blue eyes. Kayoko exhibits a notably open and unrestrained attitude toward sexuality, identifying as a nymphomaniac with progressive views on physical relationships. This contrasts with her otherwise calm, friendly demeanor toward colleagues, though she reveals a playful mischievousness in social contexts.

Guided by a practical, direct belief in the physical and mental health benefits of sexual activity, she initiates an encounter with Noriko to help her overcome deep-seated trauma from a near-rape experience. This intervention proves pivotal for Noriko’s emotional recovery and eventual openness to romance with Yasuo Kawasaki.

Beyond this, Kayoko maintains a consistent sexual relationship with teammate Isamu Ōyama, frequently initiating encounters during work hours in settings like locker rooms—sometimes observed by embarrassed colleagues. She demonstrates assertiveness in actively seducing Isamu and sustaining their physical connection amid operational duties. Her dynamic with manager Shibata remains strictly professional, while her role within the team includes fostering camaraderie despite unconventional personal interactions.