Reiko Sawamura was aware that Yuuma, her husband's stepson, harbored feelings for her that went beyond those of a mere mother figure. While she felt a quiet pleasure at this, her sense of maternal duty kept her from crossing the line. However, after her husband died in a traffic accident, on the day the forty-ninth-day memorial service ended, the two engaged in forbidden anal sex. Yuuma dreamed of pursuing a future as a ceramic artist, a passion that deeply captivated Reiko. One day, art critic Yano suddenly paid them a visit—an encounter that would bring a new shift to their illicit relationship.