Eri Saeki is a tall, fair-skinned beauty with a model's figure. While her husband is away on business, her uncle catches her having phone sex with another man and uses the recording to pressure her. Under the guise of a massage, he rolls her nipples while she resists, then produces the incriminating video whenever she tries to refuse. Cornered and unable to deny it, Eri gradually reveals how sensitive she is. Her initial hesitation fades, and it becomes obvious that she is starting to enjoy the forbidden encounter herself.