Day after day, night after night, the daughter and her husband worked hard to conceive. They both wanted a child. However, they were not blessed with children. Meanwhile, the beautiful mother, Matsumoto Marina, the protagonist of the story, was living a peaceful life with her happy daughter and her husband. Of course, she was secretly looking forward to having her first grandchild. One day, while the mother was cleaning the bathroom, the daughter and her husband were whispering nearby. Then, the mother was told that she needed to ask for advice, and the daughter and her husband made a shocking request... It was a forbidden act of insemination, and the mother, worried about her daughter and her husband not being blessed with children, succumbed to her fate...