Haruko consulted with her mother, Miho, that her husband and wife life has lost its momentum. Not knowing what to do, she asks Haruko, her husband, Ikuo, who suggests that they go on a hot spring trip together. On the day of the trip, Ikuo grinned that he had nearly achieved the success of the trip when he saw his wife's family, who breathed in an unusual air and laughed endlessly. The true purpose of Ikuo's trip is to sleep with his mother-in-law, Miho. After eating her dinner and getting tipsy, Ikuo immediately brings her into her separate room.
