Airi spends a happy married life with her husband who has been dating since high school. A gentle husband who goes out with her best friend Mika couple and a monthly dinner party without looking bad. The couple promised not to keep secrets from each other. However, Airi betrayed her husband and her best friend, and she was drowning in a deep relationship with Mika's husband Junichi. When her husband goes to work, Junichi who visits her home and Airi who exposes an indecent figure with a female face like a different person. While swearing that "this is the last time...", secret meetings are repeated...
