At a friend's birthday party, I met Hikari for the first time. As the event grew and split into several groups for the after-party, Hikari ended up in my group, and we naturally started chatting since we were seated close together. At the time, I didn't know she was married, and she seemed carefree and tipsy, as if going home with someone wouldn't be an issue. Later on, I had chances to drink with several people and learned more about Hikari's personal life. She's married to a man much older than her, and he shows absolutely no interest in sex. With that, Hikari's sexual desire has been growing stronger day by day.