Three years into her marriage, Yui, a married woman, wanted to have a child. She measured her basal body temperature every day and recorded it in her notebook, looking forward to making love on the day of ovulation. However, tragedy struck Yui at the height of her happiness. A mysterious masked man suddenly appeared, smirking as he pushed her down and forcefully inserted his erect penis. He had been targeting her ovulation day to inject his semen into her womb. The nightmare of repeated dangerous-day in-vagina rape for fertilization began!
