Dakara, Kanojo wa Kare wo Kau.

I've been married for three years. One day, 28-year-old Izumi, who is suffering from a sexless marriage, discovers a prostitute noun in her husband's luggage. Shocked by the fact that her husband was having sex with someone else, Izumi runs away from home and discovers the existence of a "sex industry for women" (......). A one-night stand that was supposed to be payback for her husband's sullenness, will it grow into forbidden feelings, or--?