Hiroshi visits his girlfriend's home for the first time in a year. He can't help but be captivated by her mother's beauty and voluptuousness. That night, after being allowed to stay overnight, Hiroshi finds himself aroused by the feeling of his mother-in-law washing his genitals in the bathtub. In the middle of the night, unable to sleep, he goes to the bedroom and sees his mother-in-law's soft, rounded figure sleeping peacefully. The young Hiroshi can't resist reaching out to her sleeping figure...