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Haruka, an advisor to the badminton club, had an affair with her colleague Ishida. Even though I started dating without knowing that the other person had a family, the relationship continued even if I knew it ... Haruka became a convenient woman. A student, Yoshii, witnessed this'relationship between two people that should not be known to anyone'. Yoshii learned that his beloved Haruka had an affair, and forced Haruka to have a physical relationship with it.