The daughter-in-law's older sister, Sakura-san, came to take care of the daughter-in-law who is going on a long business trip. Daisuke can't help but worry about the explosive breasts that tremble every time he moves. He succumbs to temptation and peeks at the bathing figure, but in the end, he is overwhelmed by Sakura's goodwill and ends up forcibly bathing together. "I'll take care of Kocchi every day until she comes home."
