With her husband away on a work assignment, Takako lives alone with her son Masaru, indulging freely in the pleasures of her lush, sensual body. Every day, she satisfies her deep-seated desires with the help of a vibrator, experimenting with various ways to fulfill her awakened lust. One morning, while going to wake Masaru, she discovers his lower body already fully erect—the shape strikingly similar to the vibrator she regularly uses. The throbbing pulse stirs Takako's passion once again. Hidden within the family bond lies an intense, forbidden attraction, now impossible to ignore.