Married for three years, Yuu has been working as a housekeeper and one day witnesses the landlord couple engaging in perverted sex using a suspicious toy. Curious about the toy, Yuu borrows it while the couple is out and uses it to masturbate out of curiosity. Just as this act becomes a habit, she notices that the room is being monitored by a camera. At that moment, her husband comes into the room and attacks Yuu. Even though she knows it's wrong, her frustrated body is stimulated with the toy and climaxes multiple times. Furthermore, Yuu is treated as the couple's toy. She becomes abnormally sensitive when she is tied up and has her clit stimulated with a strong pink vibrator, and she continues to be employed as a perverted housekeeper who indulges in pleasure...