Married for three years, Yui is a married woman who wants to have a child soon. Every day, she takes her basal body temperature and records it in her diary, looking forward to having sex on the day of ovulation to make a baby. However, tragedy strikes Yui at the height of her happiness. A mysterious masked man suddenly appears, and with a fearless smile on his face, he pushes Yui down and begins to forcefully thrust his erect cock into her. He has been aiming for the day of ovulation to inject his own sperm into her uterus. The nightmare of creampie rape on dangerous days that will be repeated until she is fertilized has begun!