In their fifth year of marriage, Kaeko and Shunsuke have purchased a condominium in the city and are living a peaceful life. However, just as Shunsuke's promotion becomes a topic of discussion, Nishioka from the personnel department suddenly pays them a visit. To her shock, Nishioka reveals that Shunsuke is having an affair with Yuna, the daughter of a company director—putting not only his career advancement but his entire position at the company at risk. Yet the true motive behind Nishioka's visit soon becomes clear: he has set his sights on Kaeko herself, adding intense tension to the story.