kasumi shirakawa, a housewife who has been married for 15 years, met a man through a matching app and hit it off. she had been busy with child-rearing and spending time for her children until recently. but as her children started going to school, she began to have more time for herself, enjoying meals and shopping with friends. however, she felt lonely because her husband did not see her as a woman, leading her to seek out strangers for sexual encounters. one day, she went on a one-night trip to a hot spring under the pretense of visiting her parents' home. she indulged in non-stop fucking and ejaculation, releasing her pent-up desires.