Ryouko, a married woman living alone with her son while her husband is stationed overseas. One night, her son's friend accidentally discovers her masturbating and forcefully takes her. Another friend, having heard about the incident, sneaks into Ryouko's bedroom behind the son's back and begins to toy with her body. Initially resisting, Ryouko gradually awakens to long-forgotten sexual pleasures, eventually writhing in ecstasy as she indulges in orgies with the young men, craving more and more pleasure.