Ah, how did it come to this! Chisato has been secretly engaging in a physical relationship with her son Shinichi, careful not to let her husband find out. Guilt begins to stir within her, and she resolves that she must end the affair someday. But Shinichi doesn't understand her feelings and continues to desire her more intensely than ever. Her heart wavers as she lives each day blaming herself—until, the moment her husband leaves the house, she falls once again into the passionate lust of her young son.