Haruko consulted with her mother, Miho, that her husband and wife life has lost its momentum. Not knowing what to do, Haruko asks her husband, Ikuo, who suggests going 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. Ikuo's true purpose of this trip is to sleep with his mother-in-law, Miho. Ikuo immediately brings Miho, who is getting tipsy after dinner, into another room.
