In her third year of marriage, Saori Nagashima is a serious and devoted housewife. Her husband works at a travel agency, is 31 years old and younger than her, and being a passive type, they've been sexless since their second year together. Usually quiet and family-oriented, she has a hidden side—she has a bad habit of drinking, and when intoxicated, unconsciously touches men's crotches, revealing her true nature as a "penis lover." Aware of this tendency, she had declared she would quit drinking, but recently at a friend's wedding after-party, she drank again and unknowingly touched her friend's penis. Unable to forget the thrill from that moment, she finds herself drawn back, seeking out penises once more.