Ayaka grew up in a strict household and kept her virginity until graduation. When she entered university, she got a boyfriend and experienced three men... One of them proposed to a man a year older than her, and they got married around the time of her graduation. Her sexual desires were satisfied and she felt fulfilled for about three years, but her husband gradually became useless... When she consulted an old friend about her sexual frustrations, she was introduced to a certain older man at a drinking party, and she had heard that her friend was also in a deep relationship... She never imagined that she would become addicted to this older man...