SOD's popular series "Hikikomori Uncle" has a special collaboration with SOD's exclusive No. 1 mature woman, Mariko Sada! This time, it's the first story in the series about a wealthy mother and her child living in her parents' home. The mother, a former business executive who possesses both beauty and intelligence, was handling her beloved son's sexual desires. It was a secret between the two that no one else knew.