After her husband was laid off and kicked out of their company housing, Mizuki moved in with her father-in-law while supporting him in his job hunt. One day, her father-in-law witnessed her washing a urinal in the kitchen and scolded Mizuki. However, scolding alone was not enough, he lifted her skirt and began to spank her hard on the buttocks. After being spanked, Mizuki had an ecstatic look on her face and seemed to be in a daze. Her father-in-law, who had noticed his wife's masochistic tendencies, made various demands on her, reviving her shriveled sexual desire and inflicting his own desires upon her.