When Yukino heard that her daughter and her husband were fighting, she bought arbitration and went out. As a mother who wishes for her daughter's happiness, she tried to persuade her to stay overnight, but the cause of the deterioration of the relationship between the two was that her son-in-law was lustful for Yukino, and Yukino's actions were like pouring oil on the fire. When Yukino found out about it, she felt confusion, guilt, and an intense body ache that blew it away. "Keep it a secret from my daughter," Yukino whispered in the ear of her son-in-law, who couldn't stand it and approached.