Sneaking around with an ex-lover

Yua Mikami is a girl who is engaged and currently living with her future husband. One day, she went to a class reunion with her high school friends. There, she met her ex-boyfriend from three years ago, who is now a successful businessman. She was forced and raped by her ex-boyfriend.

In the following days, he always found ways to have sex with her. Despite being cheated on, her fiancé still does not know anything and continues to show affection towards her. Until one day, he decides to propose and receives a letter from his lover...