Reiko realizes that her husband's stepchild, Yuuma, has feelings for her that are even greater than those of her mother. Although she was happy about this, her rationality as a mother prevented her from crossing the line, but on the 49th day of her husband's death in a traffic accident, the two of them engaged in a forbidden anal relationship. One day, as Yuuma is thinking about his bright future as he plans to establish himself as a potter, Yano, an art critic, comes to visit...