Yuri, who lost her husband, Takao, who was a year away six years ago, goes out of power on the way to buy offerings for her husband's stepchild, Hitoshi, and the Seventh Anniversary. The fear of darkness and the heat of the power outage encourage the two to gradually become a man-woman relationship, and Yuri loses reason and becomes a lustful puppet. At this time, the relationship between the two is no longer a parent and child ...