Emi has been married for years and has not had sex. She felt that it was normal and lived a peaceful life, but occasionally she felt an indescribable frustration when she heard moans coming from next door. One day, she went to her neighbor's room to receive some food from him... Hiyama, who had noticed Emi's hidden masochistic nature for some time, pushed her down as soon as he entered the room. Emi was raped and taught a new pleasure, and every time she heard the moans from next door her crotch throbbed, and before she knew it she went to him herself...