Haruka, the advisor for the badminton club, was having an affair with her colleague, Ishida. Although she started dating him without knowing he had a family, the relationship continued to drag on even after she found out... Haruka had become a woman of convenience. One day, a student named Yoshii witnessed this "relationship that must not be known by anyone." Upon discovering that his beloved Haruka was having an affair, Yoshii used it as leverage to force her into a sexual relationship.
