Yuri, who lost her husband Takao six years ago, is on the way to buy an offering for the seventh anniversary of her husband's death with her husband's stepchild, Hitoshi. The fear of the dark and the heat caused by the power outage prompts the two to gradually become a man-woman relationship, and Yuri loses her reason and becomes a puppet of her lust. After this time, the relationship between the two is no longer that of parent and child.
