Ryouko, a married woman, was unsatisfied with her sex life and growing increasingly lonely. One day, she found her neighbor, a single male student preparing for college entrance exams, had caught a cold. Feeling sorry for him, she began taking care of him. Through this process, her heart and body gradually became stirred, and eventually she could no longer restrain herself, starting affairs with men other than her husband. When her husband claimed he was going on a business trip, Ryouko called her lover. To her surprise, the man who came wasn't alone—he arrived with another man. Ryouko's lustful encounters with multiple men other than her husband made it seem as if she had completely forgotten about her spouse.