Satsuki, whose husband Eiiichi is a few years older than her, had not been intimate with him for three years. She spent her days trying to distract herself with hobbies and club activities, but her mature body left her restless. Thinking that she was no longer young, she decided to live quietly using her husband's savings. However, just as she thought this, she fell in love with a graduate student she met through volunteer work and ended up having a physical relationship with him. But Satsuki did not realize it at the time. Eiiichi had already noticed her betrayal…
