After her husband's abuse caused their son to become a recluse, Yuu suffered silently under her husband's violence, unsure of how to fix things. But when her husband died in an accident, she resolved to finally repair her relationship with her son. The two embarked on an onsen trip together. While Yuu soaked alone in the hot spring, she wept, troubled over their uncertain future. Seeing her like that, her son became aroused and suddenly attacked her, but Yuu calmly slapped him back. That night, when her son demanded again, "Let me do it," Yuu whispered, "Do whatever you want," and kissed him passionately, taking the lead.