Meguri is living happily with her beloved husband. Her husband always loves and cares for her, so Meguri has a very happy life. But recently, she always feels like someone is peeping at her, the picture hanging in the house suddenly disappears. Especially when the door lock is broken, when she calls a repairman to fix it, there are no spare parts, it takes a week to fix it. That makes Meguri feel extremely worried and insecure. And what she fears most happens, on the day of ovulation, because she forgot to close the door, she hurriedly returns home. Suddenly, a masked man attacks Meguri from behind. She is unable to resist him, so Meguri can only beg in despair, watching him "invade" her beautiful, plump body, ejaculating deep inside her uterus! This guy also took a picture of the two of them making love and threatened to post it online if Meguri reveals it. Every day, she worried about that man ejaculating into her uterus. Fortunately, Meguri's menstrual cycle was still regular, so she felt a little more secure. Since then, a month had passed, but that man had not appeared again. Just when Meguri was trying to forget everything, that masked man appeared again, on the day she ovulated. He continued to fuck her, ejaculating into her uterus, then left. And so, every month, he appeared and impregnated her. Meguri always wondered who this mysterious man who always brought her a feeling of fear mixed with pleasure was. And then when he talked to her, she immediately recognized his voice, it was the locksmith who fixed her house before!!!