Γαμιέμαι από το αφεντικό του άντρα μου κάθε Δευτέρα

Yu, the wife of office worker Amanoki, is blackmailed by her boss over a mistake he made at work, and is asked to have a sexual relationship with him. Every Monday, the boss comes to visit. One day, a video letter is sent to her husband. What is the shocking content of the letter...?