Asuka got married and started living with her father-in-law. Compared to her husband who is busy with work and rarely at home, Asuka completely trusts her kind father-in-law who helps her with the housework. However, behind her father-in-law's kindness, a smoldering sexual desire swirls like mud. Not knowing about her father-in-law's true nature, after her husband goes to work, Asuka works alone with her father-in-law to do the housework, but every time she wipes the floor, her underwear is visible under her skirt and arouses her father-in-law.