Yuko Gunji's husband has lost his sexual desire, leaving her emotionally and physically unfulfilled. At this time, her nephew Atsushi comes to stay at her home temporarily while job hunting. Meeting for the first time in three years, she is struck by how much he has matured into a confident, virile young man—his youthful, powerful body awakens desires within her that she can no longer suppress. Torn by the taboo nature of their relationship as aunt and nephew, Yuko ultimately gives in one night, unable to resist temptation, and seduces him.