Rinko is a manager at a lingerie manufacturer, but she is strict at work and is often talked about behind her back as an "arrogant female boss." Then, a mail-order company, one of her clients, complains... The company, feeling arrogant towards Rinko's businesslike attitude as she apologizes on behalf of her subordinates, becomes even more angry and forces a vibrator to be inserted into her, saying "You have no sincerity!" The complaints continue, and every time Rinko is called in, she is humiliated with a vibrator. However, before she knows it, the humiliation turns into a secret pleasure...