Kaoru, who lives with her daughter and son-in-law, accidentally finds out about their sexless marriage. Seeing the lonely son-in-law and comparing him to herself, who isn't embraced by her husband, Kaoru feels a sense of shared sorrow. However, the son-in-law had been strongly aroused by Kaoru's large breasts swaying right in front of him! Unable to resist the son-in-law's intense advances, Kaoru's frustrated body succumbs, and they end up building a forbidden relationship under the same roof...
