A few years after her beloved husband passed away, Nobuko now lives with her daughter and her husband. It was thought that the harmonious relationship would continue as it is, but his son-in-law, Yukio, happened to see Nobuko masturbating. From that day on, Yukio cannot forget Nobuko's beautiful and bewitching foolery. On a holiday when the two of them happen to be alone, Nobuko's back flashes back to the foolishness of that day. Even though he understands that it's not right, Yukio's excitement becomes uncontrollable and he abandons his reasoning...
