Momo has a happy marriage and shares a warm relationship with her husband. However, lately her nipples have become abnormally sensitive, which she finds strange even to herself. One day, her husband's coworker, craftsman Koichi Ozawa, pays a visit and quickly discovers her heightened sensitivity. Ozawa begins teasing her with rough, bold fondling, clearly enjoying her intense reactions. Drawn to his aggressive style, Momo gradually awakens to her carnal desires, and her heart is slowly taken by Ozawa...