On Friday, my younger colleague saw me at the scene of an affair...

Yuko has been in an affair with Section Chief Tokuda, who has a wife and children for a long time. One day, a colleague, Sasaki, witnesses the relationship between the two. Sasaki's love and hatred, which had always had feelings for Yuko, transforms into a twisted desire for revenge for Yuko. Sasaki threatens Yuko and forces her to form a relationship. However, Yuko, who has been trampled on, begins to feel the first awakening of a woman to the young and wild Sasaki...