Miyuki Minegishi is a milf with an insatiable sex drive, so aroused by her grandson bathing that she masturbates while using his clothes as her fetish. Despite being postmenopausal, her past as a soapland worker has kept her body intensely lustful. One day, upon discovering that her grandson is a hopeless cherry boy too intimidated to visit brothels, she decides to personally take charge and guide him step by step to overcome his fear of women.