Semasa teman wanitanya tiada dalam perjalanan malam yang panjang, dia mengongkek bekas teman wanitanya yang sudah berkahwin selama beberapa hari.

I was still in a relationship with my ex-girlfriend "Nanami," who was married and became a married woman. I thought she and my girlfriend were friends and had already put it behind them. However, a surprise kiss rekindles my love for her, and we begin a secret sexual intercourse! They forget the guilt they feel toward their lover, and they go gaga over each other for three forbidden days that they can't tell anyone about!