Her son brings his girlfriend over. Yumi's feelings of jealousy towards her grow stronger day by day. Her girlfriend is a slutty young woman who calls Yumi an old lady at every opportunity, but Yumi has the outstanding lesbian skills to charm such a young woman in an instant. And her son, who is Yumi's descendant, also has a perverted sexual desire that easily goes beyond morals... When Yumi's frustration and lust explodes, it develops into a crazy love triangle involving her son and his girlfriend!