Weekend. A young salaryman named ShinTarou, who lives with his wife in a certain place in Tokyo, was hurriedly tidying up the house to welcome his mother-in-law, who would soon arrive. His wife's mother, living in the countryside, had taken a long train ride to visit her daughter and son-in-law in the capital. Hearing the doorbell ring, ShinTarou involuntarily held his breath at the sight of his voluptuous mother-in-law entering the house.
