A housewife named Meiling lives with her husband and her daughter's family of four. Although she leads a comfortable life without any hardships, she has been having an affair because her nighttime relationship with her husband has become distant. One day, Meiling accidentally discovers a video featuring her son-in-law, Yoshiwa, at a love hotel. Although she intends to investigate the truth of the matter for the sake of her daughter, Meiling ends up revealing her own affair instead. Yoshiwa, with his young and forceful demeanor, says, "If you want to have an affair, let's do it together!" Despite being his mother-in-law, Meiling's beautiful skin and voluptuous breasts stir Yoshiwa's desires, and the two continue their sordid affair within the family...
