Popular idol actress Nonoka Sato was asked to wear the same pair of panties continuously the day before filming and arrive on set in that condition. As expected, upon arrival, her bright red panties were stained with cloudy, dried secretions on the crotch area. Her expression remains modest as always, yet her deep interest in erotic acts is clearly evident. During the masturbation scene with a vibrator, her enthusiasm shines through. In a scene with a perverted doctor treating her groin, she even exhibits squirting. The video further adds erotic tension with reverse sexual harassment toward an older man who enjoys saliva, resulting in a final product intensely focused on the stains in her panties.